<divclass=CToolTipid="tt2073"><divclass=CFunction><blockquote><tableborder=0cellspacing=0cellpadding=0class="Prototype prettyprint"><tr><td>mxEditor.prototype.undo = function ()</td></tr></table></blockquote>Undo the last change in graph.</div></div><divclass=CToolTipid="tt2074"><divclass=CFunction><blockquote><tableborder=0cellspacing=0cellpadding=0class="Prototype prettyprint"><tr><td>mxUndoableEdit.prototype.undo = function()</td></tr></table></blockquote>Undoes all changes in this edit.</div></div><divclass=CToolTipid="tt2075"><divclass=CFunction><blockquote><tableborder=0cellspacing=0cellpadding=0class="Prototype prettyprint"><tr><td>mxUndoManager.prototype.undo = function()</td></tr></table></blockquote>Undoes the last change.</div></div><divclass=CToolTipid="tt2076"><divclass=CFunction><blockquote><tableborder=0cellspacing=0cellpadding=0class="Prototype prettyprint"><tr><td><tableborder=0cellspacing=0cellpadding=0><tr><tdclass=PBeforeParametersnowrap>mxUndoManager.prototype.undoableEditHappened = function(</td><tdclass=PParameternowrap>undoableEdit</td><tdclass=PAfterParametersnowrap>)</td></tr></table></td></tr></table></blockquote>Method to be called to add new undoable edits to the history.</div></div><divclass=CToolTipid="tt2077"><divclass=CFunction><blockquote><tableborder=0cellspacing=0cellpadding=0class="Prototype prettyprint"><tr><td><tableborder=0cellspacing=0cellpadding=0><tr><tdclass=PBeforeParametersnowrap>mxGraph.prototype.ungroupCells = function(</td><tdclass=PParameternowrap>cells</td><tdclass=PAfterParametersnowrap>)</td></tr></table></td></tr></table></blockquote>Ungroups the given cells by moving the children the children to their parents parent and removing the empty groups. </div></div><divclass=CToolTipid="tt2078"><divclass=CFunction><blockquote><tableborder=0cellspacing=0cellpadding=0class="Prototype prettyprint"><tr><td><tableborder=0cellspacing=0cellpadding=0><tr><tdclass=PBeforeParametersnowrap>mxVertexHandler.prototype.union = function(</td><tdclass=PParameternowrap>bounds,</td></tr><tr><td></td><tdclass=PParameternowrap>dx,</td></tr><tr><td></td><tdclass=PParameternowrap>dy,</td></tr><tr><td></td><tdclass=PParameternowrap>index,</td></tr><tr><td></td><tdclass=PParameternowrap>gridEnabled,</td></tr><tr><td></td><tdclass=PParameternowrap>scale,</td></tr><tr><td></td><tdclass=PParameternowrap>tr,</td></tr><tr><td></td><tdclass=PParameternowrap>constrained,</td></tr><tr><td></td><tdclass=PParameternowrap>centered</td><tdclass=PAfterParametersnowrap>)</td></tr></table></td></tr></table></blockquote>Returns the union of the given bounds and location for the specified handle index.</div></div><divclass=CToolTipid="tt2079"><divclass=CFunction><blockquote><tableborder=0cellspacing=0cellpadding=0class="Prototype prettyprint"><tr><td>mxCellMarker.prototype.unmark = function()</td></tr></table></blockquote>Hides the marker and fires a mark event.</div></div><divclass=CToolTipid="tt2080"><divclass=CFunction><blockquote><tableborder=0cellspacing=0cellpadding=0class="Prototype prettyprint"><tr><td><tableborder=0cellspacing=0cellpadding=0><tr><tdclass=PBeforeParametersnowrap>mxConstraintHandler.prototype.update = function(</td><tdclass=PParameternowrap>me,</td></tr><tr><td></td><tdclass=PParameternowrap>source,</td></tr><tr><td></td><tdclass=PParameternowrap>existingEdge,</td></tr><tr><td></td><tdclass=PParameternowrap>point</td><tdclass=PAfterParametersnowrap>)</td></tr></table></td></tr></table></blockquote>Updates the state of this handler based on the given mxMouseEvent. </div></div><divclass=CToolTipid="tt2081"><divclass=CFunction><blockquote><tableborder=0cellspacing=0cellpadding=0class="Prototype prettyprint"><tr><td><tableborder=0cellspacing=0cellpadding=0><tr><tdclass=PBeforeParametersnowrap>mxOutline.prototype.update = function(</td><tdclass=PParameternowrap>revalidate</td><tdclass=PAfterParametersnowrap>)</td></tr></table></td></tr></table></blockquote>Updates the