diff --git a/dust3d.pro b/dust3d.pro
index a8c45535..c3a00a71 100644
--- a/dust3d.pro
+++ b/dust3d.pro
@@ -18,12 +18,6 @@ HEADERS += src/modelofflinerender.h
 SOURCES += src/modelwidget.cpp
 HEADERS += src/modelwidget.h
 
-SOURCES += src/skeletonnodepropertywidget.cpp
-HEADERS += src/skeletonnodepropertywidget.h
-
-SOURCES += src/skeletonedgepropertywidget.cpp
-HEADERS += src/skeletonedgepropertywidget.h
-
 SOURCES += src/skeletondocument.cpp
 HEADERS += src/skeletondocument.h
 
@@ -33,9 +27,6 @@ HEADERS += src/skeletondocumentwindow.h
 SOURCES += src/skeletongraphicswidget.cpp
 HEADERS += src/skeletongraphicswidget.h
 
-SOURCES += src/skeletonhistorylistwidget.cpp
-HEADERS += src/skeletonhistorylistwidget.h
-
 SOURCES += src/skeletonpartlistwidget.cpp
 HEADERS += src/skeletonpartlistwidget.h
 
diff --git a/src/meshgenerator.cpp b/src/meshgenerator.cpp
index a01479fc..bf0b4b0c 100644
--- a/src/meshgenerator.cpp
+++ b/src/meshgenerator.cpp
@@ -117,6 +117,7 @@ void MeshGenerator::process()
     void *meshliteContext = meshlite_create_context();
     std::map<QString, int> partBmeshMap;
     std::map<QString, int> bmeshNodeMap;
+    bool hasSubdiv = false;
     
     QRectF mainProfile, sideProfile;
     resolveBoundingBox(&mainProfile, &sideProfile);
@@ -207,8 +208,10 @@ void MeshGenerator::process()
         int meshId = meshlite_bmesh_generate_mesh(meshliteContext, bmeshId, 0);
         if (isTrueValueString(part->second["subdived"])) {
             int subdivedMeshId = subdivMesh(meshliteContext, meshId);
-            if (subdivedMeshId > 0)
+            if (subdivedMeshId > 0) {
                 meshId = subdivedMeshId;
+                hasSubdiv = true;
+            }
         }
         if (m_requirePartPreviewMap.find(partIdIt) != m_requirePartPreviewMap.end()) {
             ModelOfflineRender *render = m_partPreviewRenderMap[partIdIt];
@@ -227,7 +230,7 @@ void MeshGenerator::process()
     } else if (meshIds.size() > 0) {
         mergedMeshId = meshIds[0];
     }
-    if (mergedMeshId > 0) {
+    if (mergedMeshId > 0 && !hasSubdiv) {
         mergedMeshId = meshlite_combine_coplanar_faces(meshliteContext, mergedMeshId);
     }
     
diff --git a/src/modelofflinerender.cpp b/src/modelofflinerender.cpp
index af689c7d..d803bb06 100644
--- a/src/modelofflinerender.cpp
+++ b/src/modelofflinerender.cpp
@@ -54,8 +54,8 @@ QImage ModelOfflineRender::toImage(const QSize &size)
     m_context->functions()->glViewport(0, 0, size.width(), size.height());
     
     if (nullptr != m_mesh) {
-        int xRot = 0;
-        int yRot = 0;
+        int xRot = -30 * 16;
+        int yRot = 45 * 16;
         int zRot = 0;
         QMatrix4x4 proj;
         QMatrix4x4 camera;
diff --git a/src/modelwidget.cpp b/src/modelwidget.cpp
index 9c8d0b39..acfb0c01 100644
--- a/src/modelwidget.cpp
+++ b/src/modelwidget.cpp
@@ -13,8 +13,8 @@ bool ModelWidget::m_transparent = true;
 
 ModelWidget::ModelWidget(QWidget *parent)
     : QOpenGLWidget(parent),
-      m_xRot(0),
-      m_yRot(0),
+      m_xRot(-30 * 16),
+      m_yRot(45 * 16),
       m_zRot(0),
       m_program(nullptr),
       m_moveStarted(false),
diff --git a/src/skeletondocument.cpp b/src/skeletondocument.cpp
index a7235880..4fb17bb0 100644
--- a/src/skeletondocument.cpp
+++ b/src/skeletondocument.cpp
@@ -482,26 +482,6 @@ void SkeletonDocument::splitPartByEdge(std::vector<std::vector<QUuid>> *groups,
     }
 }
 
-void SkeletonDocument::setEdgeBranchMode(QUuid edgeId, SkeletonEdgeBranchMode mode)
-{
-    auto edgeIt = edgeMap.find(edgeId);
-    if (edgeIt == edgeMap.end()) {
-        qDebug() << "Find edge failed:" << edgeId;
-        return;
-    }
-    edgeIt->second.branchMode = mode;
-}
-
-void SkeletonDocument::setNodeRootMarkMode(QUuid nodeId, SkeletonNodeRootMarkMode mode)
-{
-    auto nodeIt = nodeMap.find(nodeId);
-    if (nodeIt == nodeMap.end()) {
-        qDebug() << "Find node failed:" << nodeId;
-        return;
-    }
-    nodeIt->second.rootMarkMode = mode;
-}
-
 void SkeletonDocument::toSnapshot(SkeletonSnapshot *snapshot, const std::set<QUuid> &limitNodeIds) const
 {
     std::set<QUuid> limitPartIds;
@@ -532,7 +512,6 @@ void SkeletonDocument::toSnapshot(SkeletonSnapshot *snapshot, const std::set<QUu
         node["x"] = QString::number(nodeIt.second.x);
         node["y"] = QString::number(nodeIt.second.y);
         node["z"] = QString::number(nodeIt.second.z);
-        node["rootMarkMode"] = SkeletonNodeRootMarkModeToString(nodeIt.second.rootMarkMode);
         node["partId"] = nodeIt.second.partId.toString();
         if (!nodeIt.second.name.isEmpty())
             node["name"] = nodeIt.second.name;
@@ -550,7 +529,6 @@ void SkeletonDocument::toSnapshot(SkeletonSnapshot *snapshot, const std::set<QUu
         edge["id"] = edgeIt.second.id.toString();
         edge["from"] = edgeIt.second.nodeIds[0].toString();
         edge["to"] = edgeIt.second.nodeIds[1].toString();
-        edge["branchMode"] = SkeletonEdgeBranchModeToString(edgeIt.second.branchMode);
         edge["partId"] = edgeIt.second.partId.toString();
         if (!edgeIt.second.name.isEmpty())
             edge["name"] = edgeIt.second.name;
@@ -591,7 +569,6 @@ void SkeletonDocument::addFromSnapshot(const SkeletonSnapshot &snapshot)
         node.y = valueOfKeyInMapOrEmpty(nodeKv.second, "y").toFloat();
         node.z = valueOfKeyInMapOrEmpty(nodeKv.second, "z").toFloat();
         node.partId = oldNewIdMap[QUuid(valueOfKeyInMapOrEmpty(nodeKv.second, "partId"))];
-        node.rootMarkMode = SkeletonNodeRootMarkModeFromString(valueOfKeyInMapOrEmpty(nodeKv.second, "rootMarkMode"));
         nodeMap[node.id] = node;
     }
     for (const auto &edgeKv : snapshot.edges) {
@@ -603,7 +580,6 @@ void SkeletonDocument::addFromSnapshot(const SkeletonSnapshot &snapshot)
         oldNewIdMap[QUuid(edgeKv.first)] = edge.id;
         edge.name = valueOfKeyInMapOrEmpty(edgeKv.second, "name");
         edge.partId = oldNewIdMap[QUuid(valueOfKeyInMapOrEmpty(edgeKv.second, "partId"))];
-        edge.branchMode = SkeletonEdgeBranchModeFromString(valueOfKeyInMapOrEmpty(edgeKv.second, "branchMode"));
         QString fromNodeId = valueOfKeyInMapOrEmpty(edgeKv.second, "from");
         if (!fromNodeId.isEmpty()) {
             QUuid fromId = oldNewIdMap[QUuid(fromNodeId)];
@@ -660,56 +636,6 @@ void SkeletonDocument::fromSnapshot(const SkeletonSnapshot &snapshot)
     addFromSnapshot(snapshot);
 }
 
-const char *SkeletonNodeRootMarkModeToString(SkeletonNodeRootMarkMode mode)
-{
-    switch (mode) {
-        case SkeletonNodeRootMarkMode::Auto:
-            return "auto";
-        case SkeletonNodeRootMarkMode::MarkAsRoot:
-            return "markAsRoot";
-        case SkeletonNodeRootMarkMode::MarkAsNotRoot:
-            return "markAsNotRoot";
-        default:
-            return "";
-    }
-}
-
-SkeletonNodeRootMarkMode SkeletonNodeRootMarkModeFromString(const QString &mode)
-{
-    if (mode == "auto")
-        return SkeletonNodeRootMarkMode::Auto;
-    if (mode == "markAsRoot")
-        return SkeletonNodeRootMarkMode::MarkAsRoot;
-    if (mode == "markAsNotRoot")
-        return SkeletonNodeRootMarkMode::MarkAsNotRoot;
-    return SkeletonNodeRootMarkMode::Auto;
-}
-
-const char *SkeletonEdgeBranchModeToString(SkeletonEdgeBranchMode mode)
-{
-    switch (mode) {
-        case SkeletonEdgeBranchMode::Auto:
-            return "auto";
-        case SkeletonEdgeBranchMode::NoTrivial:
-            return "noTrivial";
-        case SkeletonEdgeBranchMode::Trivial:
-            return "trivial";
-        default:
-            return "";
-    }
-}
-
-SkeletonEdgeBranchMode SkeletonEdgeBranchModeFromString(const QString &mode)
-{
-    if (mode == "auto")
-        return SkeletonEdgeBranchMode::Auto;
-    if (mode == "noTrivial")
-        return SkeletonEdgeBranchMode::NoTrivial;
-    if (mode == "trivial")
-        return SkeletonEdgeBranchMode::Trivial;
-    return SkeletonEdgeBranchMode::Auto;
-}
-
 Mesh *SkeletonDocument::takeResultMesh()
 {
     Mesh *resultMesh = m_resultMesh;
@@ -787,12 +713,8 @@ void SkeletonDocument::generateMesh()
     toSnapshot(snapshot);
     m_meshGenerator = new MeshGenerator(snapshot, thread);
     m_meshGenerator->moveToThread(thread);
-    //m_meshGenerator->addPreviewRequirement();
     for (auto &part: partMap) {
-        //if (part.second.previewIsObsolete) {
-        //    part.second.previewIsObsolete = false;
-            m_meshGenerator->addPartPreviewRequirement(part.first.toString());
-        //}
+        m_meshGenerator->addPartPreviewRequirement(part.first.toString());
     }
     connect(thread, &QThread::started, m_meshGenerator, &MeshGenerator::process);
     connect(m_meshGenerator, &MeshGenerator::finished, this, &SkeletonDocument::meshReady);
@@ -895,3 +817,12 @@ bool SkeletonDocument::hasPastableContentInClipboard() const
     return false;
 }
 
+bool SkeletonDocument::undoable() const
+{
+    return !m_undoItems.empty();
+}
+
+bool SkeletonDocument::redoable() const
+{
+    return !m_redoItems.empty();
+}
diff --git a/src/skeletondocument.h b/src/skeletondocument.h
index b7d0a4b3..984b2cf8 100644
--- a/src/skeletondocument.h
+++ b/src/skeletondocument.h
@@ -11,16 +11,6 @@
 #include "mesh.h"
 #include "meshgenerator.h"
 
-enum class SkeletonNodeRootMarkMode
-{
-    Auto = 0,
-    MarkAsRoot,
-    MarkAsNotRoot
-};
-
-const char *SkeletonNodeRootMarkModeToString(SkeletonNodeRootMarkMode mode);
-SkeletonNodeRootMarkMode SkeletonNodeRootMarkModeFromString(const QString &mode);
-
 class SkeletonNode
 {
 public:
@@ -28,8 +18,7 @@ public:
         x(0),
         y(0),
         z(0),
-        radius(0),
-        rootMarkMode(SkeletonNodeRootMarkMode::Auto)
+        radius(0)
     {
         id = withId.isNull() ? QUuid::createUuid() : withId;
     }
@@ -48,34 +37,19 @@ public:
     float y;
     float z;
     float radius;
-    bool xMirrored;
-    bool zMirrored;
-    SkeletonNodeRootMarkMode rootMarkMode;
     std::vector<QUuid> edgeIds;
 };
 
-enum class SkeletonEdgeBranchMode
-{
-    Auto = 0,
-    Trivial,
-    NoTrivial
-};
-
-const char *SkeletonEdgeBranchModeToString(SkeletonEdgeBranchMode mode);
-SkeletonEdgeBranchMode SkeletonEdgeBranchModeFromString(const QString &mode);
-
 class SkeletonEdge
 {
 public:
-    SkeletonEdge(const QUuid &withId=QUuid()) :
-        branchMode(SkeletonEdgeBranchMode::Auto)
+    SkeletonEdge(const QUuid &withId=QUuid())
     {
         id = withId.isNull() ? QUuid::createUuid() : withId;
     }
     QUuid id;
     QUuid partId;
     QString name;
-    SkeletonEdgeBranchMode branchMode;
     std::vector<QUuid> nodeIds;
     QUuid neighborOf(QUuid nodeId) const
     {
@@ -95,12 +69,10 @@ public:
     bool subdived;
     QImage preview;
     std::vector<QUuid> nodeIds;
-    bool previewIsObsolete;
     SkeletonPart(const QUuid &withId=QUuid()) :
         visible(true),
         locked(false),
-        subdived(false),
-        previewIsObsolete(true)
+        subdived(false)
     {
         id = withId.isNull() ? QUuid::createUuid() : withId;
     }
@@ -171,6 +143,8 @@ public:
     QImage preview;
     void updateTurnaround(const QImage &image);
     bool hasPastableContentInClipboard() const;
+    bool undoable() const;
+    bool redoable() const;
 public slots:
     void removeNode(QUuid nodeId);
     void removeEdge(QUuid edgeId);
@@ -182,8 +156,6 @@ public slots:
     void setNodeRadius(QUuid nodeId, float radius);
     void addEdge(QUuid fromNodeId, QUuid toNodeId);
     void setEditMode(SkeletonDocumentEditMode mode);
-    void setEdgeBranchMode(QUuid edgeId, SkeletonEdgeBranchMode mode);
-    void setNodeRootMarkMode(QUuid nodeId, SkeletonNodeRootMarkMode mode);
     void uiReady();
     void generateMesh();
     void meshReady();
diff --git a/src/skeletondocumentwindow.cpp b/src/skeletondocumentwindow.cpp
index 16deac23..dae69cbc 100644
--- a/src/skeletondocumentwindow.cpp
+++ b/src/skeletondocumentwindow.cpp
@@ -9,8 +9,6 @@
 #include "skeletondocumentwindow.h"
 #include "skeletongraphicswidget.h"
 #include "skeletonpartlistwidget.h"
-#include "skeletonedgepropertywidget.h"
-#include "skeletonnodepropertywidget.h"
 #include "theme.h"
 
 SkeletonDocumentWindow::SkeletonDocumentWindow() :
@@ -41,18 +39,6 @@ SkeletonDocumentWindow::SkeletonDocumentWindow() :
     QPushButton *zoomOutButton = new QPushButton(QChar(fa::searchminus));
     initButton(zoomOutButton);
     
-    QPushButton *changeTurnaroundButton = new QPushButton(QChar(fa::image));
-    initButton(changeTurnaroundButton);
-    
-    QPushButton *markCenterButton = new QPushButton(QChar(fa::bullseye));
-    initButton(markCenterButton);
-    
-    QPushButton *markTrivialBranchButton = new QPushButton(QChar(fa::link));
-    initButton(markTrivialBranchButton);
-    
-    QPushButton *markMirrorButton = new QPushButton(QChar(fa::clone));
-    initButton(markMirrorButton);
-    
     toolButtonLayout->addWidget(undoButton);
     toolButtonLayout->addSpacing(10);
     toolButtonLayout->addWidget(addButton);
@@ -60,12 +46,6 @@ SkeletonDocumentWindow::SkeletonDocumentWindow() :
     toolButtonLayout->addWidget(dragButton);
     toolButtonLayout->addWidget(zoomInButton);
     toolButtonLayout->addWidget(zoomOutButton);
-    //toolButtonLayout->addSpacing(10);
-    //toolButtonLayout->addWidget(changeTurnaroundButton);
-    //toolButtonLayout->addSpacing(30);
-    //toolButtonLayout->addWidget(markCenterButton);
-    //toolButtonLayout->addWidget(markTrivialBranchButton);
-    //toolButtonLayout->addWidget(markMirrorButton);
     
     QLabel *dust3dJezzasoftLabel = new QLabel;
     QImage dust3dJezzasoftImage;
@@ -105,36 +85,10 @@ SkeletonDocumentWindow::SkeletonDocumentWindow() :
     SkeletonPartListWidget *partListWidget = new SkeletonPartListWidget(m_document);
     partListWidget->setMaximumWidth(Theme::previewImageSize);
     
-    //QTabWidget *firstTabWidget = new QTabWidget;
-    //firstTabWidget->setFont(Theme::awesome()->font(Theme::toolIconFontSize * 3 / 4));
-    //firstTabWidget->setMaximumWidth(200);
-    //firstTabWidget->addTab(partListWidget, QChar(fa::puzzlepiece));
-    //firstTabWidget->addTab(new QWidget, QChar(fa::history));
-    //firstTabWidget->addTab(new QWidget, QChar(fa::wrench));
-    
-    //SkeletonEdgePropertyWidget *edgePropertyWidget = new SkeletonEdgePropertyWidget(m_document);
-    //SkeletonNodePropertyWidget *nodePropertyWidget = new SkeletonNodePropertyWidget(m_document);
-    
-    //QVBoxLayout *propertyLayout = new QVBoxLayout;
-    //propertyLayout->addWidget(edgePropertyWidget);
-    //propertyLayout->addWidget(nodePropertyWidget);
-    
-    //QWidget *propertyWidget = new QWidget;
-    //propertyWidget->setLayout(propertyLayout);
-    
-    //QTabWidget *secondTabWidget = new QTabWidget;
-    //secondTabWidget->setFont(Theme::awesome()->font(Theme::toolIconFontSize * 3 / 4));
-    //secondTabWidget->setMaximumWidth(200);
-    //secondTabWidget->setMaximumHeight(90);
-    //secondTabWidget->addTab(propertyWidget, QChar(fa::adjust));
-    
     QVBoxLayout *mainRightLayout = new QVBoxLayout;
     mainRightLayout->setSpacing(0);
-    //mainRightLayout->setContentsMargins(5, 5, 5, 5);
     mainRightLayout->setContentsMargins(0, 0, 0, 0);
     mainRightLayout->addWidget(partListWidget);
-    //mainRightLayout->addWidget(firstTabWidget);
-    //mainRightLayout->addWidget(secondTabWidget);
     
     QHBoxLayout *mainLayout = new QHBoxLayout;
     mainLayout->setSpacing(0);
@@ -155,8 +109,6 @@ SkeletonDocumentWindow::SkeletonDocumentWindow() :
     connect(m_document, &SkeletonDocument::turnaroundChanged,
         graphicsWidget, &SkeletonGraphicsWidget::turnaroundChanged);
     
-    connect(changeTurnaroundButton, &QPushButton::clicked, this, &SkeletonDocumentWindow::changeTurnaround);
-    
     connect(undoButton, &QPushButton::clicked, [=]() {
         m_document->undo();
     });
diff --git a/src/skeletonedgepropertywidget.cpp b/src/skeletonedgepropertywidget.cpp
deleted file mode 100644
index fcdd9b33..00000000
--- a/src/skeletonedgepropertywidget.cpp
+++ /dev/null
@@ -1,53 +0,0 @@
-#include <QFormLayout>
-#include <QObject>
-#include <QComboBox>
-#include <QtGlobal>
-#include "skeletonedgepropertywidget.h"
-
-SkeletonEdgePropertyWidget::SkeletonEdgePropertyWidget(const SkeletonDocument *document) :
-    m_branchModeComboBox(nullptr),
-    m_document(document)
-{
-    m_branchModeComboBox = new QComboBox;
-    
-    m_branchModeComboBox->insertItem(0, tr("Auto"), (int)SkeletonEdgeBranchMode::Auto);
-    m_branchModeComboBox->insertItem(1, tr("No Trivial"), (int)SkeletonEdgeBranchMode::NoTrivial);
-    m_branchModeComboBox->insertItem(2, tr("Trivial"), (int)SkeletonEdgeBranchMode::Trivial);
-    
-    QFormLayout *formLayout = new QFormLayout;
-    formLayout->addRow(tr("Joint Branch Mode:"), m_branchModeComboBox);
-    
-    setLayout(formLayout);
-    
-    hide();
-
-    connect(m_branchModeComboBox, static_cast<void (QComboBox::*)(int)>(&QComboBox::currentIndexChanged), [=](int index) {
-        if (-1 != index) {
-            int mode = m_branchModeComboBox->itemData(index).toInt();
-            emit setEdgeBranchMode(m_edgeId, static_cast<SkeletonEdgeBranchMode>(mode));
-        }
-    });
-}
-
-void SkeletonEdgePropertyWidget::showProperties(QUuid edgeId)
-{
-    m_edgeId = edgeId;
-    updateData();
-    show();
-}
-
-void SkeletonEdgePropertyWidget::updateData()
-{
-    const SkeletonEdge *edge = m_document->findEdge(m_edgeId);
-    if (nullptr == edge) {
-        hide();
-        return;
-    }
-    int selectIndex = m_branchModeComboBox->findData((int)edge->branchMode);
-    m_branchModeComboBox->setCurrentIndex(selectIndex);
-}
-
-QUuid SkeletonEdgePropertyWidget::currentEdgeId()
-{
-    return m_edgeId;
-}
diff --git a/src/skeletonedgepropertywidget.h b/src/skeletonedgepropertywidget.h
deleted file mode 100644
index 5e8282b2..00000000
--- a/src/skeletonedgepropertywidget.h
+++ /dev/null
@@ -1,26 +0,0 @@
-#ifndef SKELETON_EDGE_PROPERTY_WIDGET_H
-#define SKELETON_EDGE_PROPERTY_WIDGET_H
-#include <QWidget>
-#include <QComboBox>
-#include <QObject>
-#include "skeletondocument.h"
-
-class SkeletonEdgePropertyWidget : public QWidget
-{
-    Q_OBJECT
-signals:
-    void setEdgeBranchMode(QUuid edgeId, SkeletonEdgeBranchMode mode);
-public slots:
-    void showProperties(QUuid edgeId);
-public:
-    SkeletonEdgePropertyWidget(const SkeletonDocument *document);
-    QUuid currentEdgeId();
-private:
-    void updateData();
-private:
-    QComboBox *m_branchModeComboBox;
-    const SkeletonDocument *m_document;
-    QUuid m_edgeId;
-};
-
-#endif
diff --git a/src/skeletongraphicswidget.cpp b/src/skeletongraphicswidget.cpp
index b995d85b..5ca43861 100644
--- a/src/skeletongraphicswidget.cpp
+++ b/src/skeletongraphicswidget.cpp
@@ -77,61 +77,73 @@ void SkeletonGraphicsWidget::showContextMenu(const QPoint &pos)
     
     QMenu contextMenu(this);
     
-    QAction addAction("Add..", this);
+    QAction addAction(tr("Add.."), this);
     connect(&addAction, &QAction::triggered, [=]() {
         emit setEditMode(SkeletonDocumentEditMode::Add);
     });
     contextMenu.addAction(&addAction);
     
-    QAction deleteAction("Delete", this);
+    QAction undoAction(tr("Undo"), this);
+    if (m_document->undoable()) {
+        connect(&undoAction, &QAction::triggered, m_document, &SkeletonDocument::undo);
+        contextMenu.addAction(&undoAction);
+    }
+    
+    QAction redoAction(tr("Redo"), this);
+    if (m_document->redoable()) {
+        connect(&redoAction, &QAction::triggered, m_document, &SkeletonDocument::redo);
+        contextMenu.addAction(&redoAction);
+    }
+    
+    QAction deleteAction(tr("Delete"), this);
     if (!m_rangeSelectionSet.empty()) {
         connect(&deleteAction, &QAction::triggered, this, &SkeletonGraphicsWidget::deleteSelected);
         contextMenu.addAction(&deleteAction);
     }
     
-    QAction cutAction("Cut", this);
+    QAction cutAction(tr("Cut"), this);
     if (!m_rangeSelectionSet.empty()) {
         connect(&cutAction, &QAction::triggered, this, &SkeletonGraphicsWidget::cut);
         contextMenu.addAction(&cutAction);
     }
     
-    QAction copyAction("Copy", this);
+    QAction copyAction(tr("Copy"), this);
     if (!m_rangeSelectionSet.empty()) {
         connect(&copyAction, &QAction::triggered, this, &SkeletonGraphicsWidget::copy);
         contextMenu.addAction(&copyAction);
     }
     
-    QAction pasteAction("Paste", this);
+    QAction pasteAction(tr("Paste"), this);
     if (m_document->hasPastableContentInClipboard()) {
         connect(&pasteAction, &QAction::triggered, m_document, &SkeletonDocument::paste);
         contextMenu.addAction(&pasteAction);
     }
     
-    QAction flipHorizontallyAction("H Flip", this);
+    QAction flipHorizontallyAction(tr("H Flip"), this);
     if (!m_rangeSelectionSet.empty() && !isSingleNodeSelected()) {
         connect(&flipHorizontallyAction, &QAction::triggered, this, &SkeletonGraphicsWidget::flipHorizontally);
         contextMenu.addAction(&flipHorizontallyAction);
     }
     
-    QAction flipVerticallyAction("V Flip", this);
+    QAction flipVerticallyAction(tr("V Flip"), this);
     if (!m_rangeSelectionSet.empty() && !isSingleNodeSelected()) {
         connect(&flipVerticallyAction, &QAction::triggered, this, &SkeletonGraphicsWidget::flipVertically);
         contextMenu.addAction(&flipVerticallyAction);
     }
     
-    QAction selectAllAction("Select All", this);
+    QAction selectAllAction(tr("Select All"), this);
     if (!nodeItemMap.empty()) {
         connect(&selectAllAction, &QAction::triggered, this, &SkeletonGraphicsWidget::selectAll);
         contextMenu.addAction(&selectAllAction);
     }
     
-    QAction selectPartAllAction("Select Part", this);
+    QAction selectPartAllAction(tr("Select Part"), this);
     if (!nodeItemMap.empty()) {
         connect(&selectPartAllAction, &QAction::triggered, this, &SkeletonGraphicsWidget::selectPartAll);
         contextMenu.addAction(&selectPartAllAction);
     }
     
-    QAction unselectAllAction("Unselect All", this);
+    QAction unselectAllAction(tr("Unselect All"), this);
     if (!m_rangeSelectionSet.empty()) {
         connect(&unselectAllAction, &QAction::triggered, this, &SkeletonGraphicsWidget::unselectAll);
         contextMenu.addAction(&unselectAllAction);
@@ -139,7 +151,7 @@ void SkeletonGraphicsWidget::showContextMenu(const QPoint &pos)
     
     contextMenu.addSeparator();
     
-    QAction changeTurnaroundAction("Change Turnaround..", this);
+    QAction changeTurnaroundAction(tr("Change Turnaround.."), this);
     connect(&changeTurnaroundAction, &QAction::triggered, [=]() {
         emit changeTurnaround();
     });
diff --git a/src/skeletonhistorylistwidget.cpp b/src/skeletonhistorylistwidget.cpp
deleted file mode 100644
index e69de29b..00000000
diff --git a/src/skeletonhistorylistwidget.h b/src/skeletonhistorylistwidget.h
deleted file mode 100644
index e69de29b..00000000
diff --git a/src/skeletonnodepropertywidget.cpp b/src/skeletonnodepropertywidget.cpp
deleted file mode 100644
index 88a88101..00000000
--- a/src/skeletonnodepropertywidget.cpp
+++ /dev/null
@@ -1,50 +0,0 @@
-#include <QFormLayout>
-#include "skeletonnodepropertywidget.h"
-
-SkeletonNodePropertyWidget::SkeletonNodePropertyWidget(const SkeletonDocument *document) :
-    m_rootMarkModeComboBox(nullptr),
-    m_document(document)
-{
-    m_rootMarkModeComboBox = new QComboBox;
-    
-    m_rootMarkModeComboBox->insertItem(0, tr("Auto"), (int)SkeletonNodeRootMarkMode::Auto);
-    m_rootMarkModeComboBox->insertItem(1, tr("Mark as Root"), (int)SkeletonNodeRootMarkMode::MarkAsRoot);
-    m_rootMarkModeComboBox->insertItem(2, tr("Mark as Not Root"), (int)SkeletonNodeRootMarkMode::MarkAsNotRoot);
-    
-    QFormLayout *formLayout = new QFormLayout;
-    formLayout->addRow(tr("Root Mark:"), m_rootMarkModeComboBox);
-    
-    setLayout(formLayout);
-    
-    hide();
-
-    connect(m_rootMarkModeComboBox, static_cast<void (QComboBox::*)(int)>(&QComboBox::currentIndexChanged), [=](int index) {
-        if (-1 != index) {
-            int mode = m_rootMarkModeComboBox->itemData(index).toInt();
-            emit setNodeRootMarkMode(m_nodeId, static_cast<SkeletonNodeRootMarkMode>(mode));
-        }
-    });
-}
-
-void SkeletonNodePropertyWidget::showProperties(QUuid nodeId)
-{
-    m_nodeId = nodeId;
-    updateData();
-    show();
-}
-
-void SkeletonNodePropertyWidget::updateData()
-{
-    const SkeletonNode *node = m_document->findNode(m_nodeId);
-    if (nullptr == node) {
-        hide();
-        return;
-    }
-    int selectIndex = m_rootMarkModeComboBox->findData((int)node->rootMarkMode);
-    m_rootMarkModeComboBox->setCurrentIndex(selectIndex);
-}
-
-QUuid SkeletonNodePropertyWidget::currentNodeId()
-{
-    return m_nodeId;
-}
diff --git a/src/skeletonnodepropertywidget.h b/src/skeletonnodepropertywidget.h
deleted file mode 100644
index 6f3dcd95..00000000
--- a/src/skeletonnodepropertywidget.h
+++ /dev/null
@@ -1,26 +0,0 @@
-#ifndef SKELETON_NODE_PROPERTY_WIDGET_H
-#define SKELETON_NODE_PROPERTY_WIDGET_H
-#include <QWidget>
-#include <QDoubleSpinBox>
-#include <QComboBox>
-#include "skeletondocument.h"
-
-class SkeletonNodePropertyWidget : public QWidget
-{
-    Q_OBJECT
-signals:
-    void setNodeRootMarkMode(QUuid nodeId, SkeletonNodeRootMarkMode mode);
-public slots:
-    void showProperties(QUuid nodeId);
-public:
-    SkeletonNodePropertyWidget(const SkeletonDocument *document);
-    QUuid currentNodeId();
-private:
-    void updateData();
-private:
-    QComboBox *m_rootMarkModeComboBox;
-    const SkeletonDocument *m_document;
-    QUuid m_nodeId;
-};
-
-#endif