diff --git a/MainWindow.cpp b/MainWindow.cpp
index d110865..2d35171 100644
--- a/MainWindow.cpp
+++ b/MainWindow.cpp
@@ -1398,7 +1398,7 @@ void MainWindow::createLayout()
 
   sourceCanvasToolbar = new MapperGLCanvasToolbar(sourceCanvas, this);
   QVBoxLayout* sourceLayout = new QVBoxLayout;
-  QWidget* sourcePanel = new QWidget(this);
+  sourcePanel = new QWidget(this);
 
   sourceLayout->setContentsMargins(0, 0, 0, 0);
   sourceLayout->addWidget(sourceCanvas);
@@ -1412,7 +1412,7 @@ void MainWindow::createLayout()
 
   destinationCanvasToolbar = new MapperGLCanvasToolbar(destinationCanvas, this);
   QVBoxLayout* destinationLayout = new QVBoxLayout;
-  QWidget* destinationPanel = new QWidget(this);
+  destinationPanel = new QWidget(this);
 
   destinationLayout->setContentsMargins(0, 0, 0, 0);
   destinationLayout->addWidget(destinationCanvas);
diff --git a/MainWindow.h b/MainWindow.h
index 3a51dfb..fec4b4d 100644
--- a/MainWindow.h
+++ b/MainWindow.h
@@ -370,8 +370,10 @@ private:
 
   MapperGLCanvas* sourceCanvas;
   MapperGLCanvasToolbar* sourceCanvasToolbar;
+  QWidget* sourcePanel;
   MapperGLCanvas* destinationCanvas;
   MapperGLCanvasToolbar* destinationCanvasToolbar;
+  QWidget* destinationPanel;
 
   OutputGLWindow* outputWindow;
   ConsoleWindow* consoleWindow;