diff --git a/examples/proto_debuger/base_form.cpp b/examples/proto_debuger/base_form.cpp
index eb92bd02..3a559435 100644
--- a/examples/proto_debuger/base_form.cpp
+++ b/examples/proto_debuger/base_form.cpp
@@ -120,6 +120,7 @@ LRESULT BasicForm::HandleMessage(UINT uMsg, WPARAM wParam, LPARAM lParam)
 			}
 			return true;
 			});
+		mMonitorNewSelect->Close();
 	}
 
 
@@ -178,6 +179,7 @@ LRESULT BasicForm::HandleMessage(UINT uMsg, WPARAM wParam, LPARAM lParam)
 				return true;
 			}
 		);
+		mMonitorNewSelect->Close();
 	}
 
 	if (uMsg == WM_ADD_UART_MONITOR) {