diff --git a/Polyhedron/demo/Polyhedron/Polyhedron_demo_mean_curvature_flow_skeleton_plugin.cpp b/Polyhedron/demo/Polyhedron/Polyhedron_demo_mean_curvature_flow_skeleton_plugin.cpp
index b90b84d72fb..d65b8b4777c 100644
--- a/Polyhedron/demo/Polyhedron/Polyhedron_demo_mean_curvature_flow_skeleton_plugin.cpp
+++ b/Polyhedron/demo/Polyhedron/Polyhedron_demo_mean_curvature_flow_skeleton_plugin.cpp
@@ -123,6 +123,36 @@ public:
     actionConvert_to_medial_skeleton->setObjectName("actionConvert_to_medial_skeleton");
 
     Polyhedron_demo_plugin_helper::init(mainWindow, scene_interface);
+
+    dockWidget = new QDockWidget(mw);
+    dockWidget->setVisible(false);
+    ui = new Ui::Mean_curvature_flow_skeleton_plugin();
+    ui->setupUi(dockWidget);
+    dockWidget->setFeatures(QDockWidget::DockWidgetMovable
+                          | QDockWidget::DockWidgetFloatable
+                          | QDockWidget::DockWidgetClosable);
+    dockWidget->setWindowTitle("Mean Curvature Flow Skeleton");
+    add_dock_widget(dockWidget);
+
+    connect(ui->pushButton_contract, SIGNAL(clicked()),
+            this, SLOT(on_actionContract()));
+    connect(ui->pushButton_collapse, SIGNAL(clicked()),
+            this, SLOT(on_actionCollapse()));
+    connect(ui->pushButton_split, SIGNAL(clicked()),
+            this, SLOT(on_actionSplit()));
+    connect(ui->pushButton_degeneracy, SIGNAL(clicked()),
+            this, SLOT(on_actionDegeneracy()));
+    connect(ui->pushButton_run, SIGNAL(clicked()),
+            this, SLOT(on_actionRun()));
+    connect(ui->pushButton_skeletonize, SIGNAL(clicked()),
+            this, SLOT(on_actionSkeletonize()));
+    connect(ui->pushButton_converge, SIGNAL(clicked()),
+            this, SLOT(on_actionConverge()));
+    connect(dynamic_cast<Scene*>(scene), SIGNAL(updated_bbox()),
+            this, SLOT(on_actionUpdateBBox()));
+    connect(ui->pushButton_segment, SIGNAL(clicked()),
+            this, SLOT(on_actionSegment()));
+
   }
 
   QList<QAction*> actions() const {
@@ -347,6 +377,9 @@ private:
 
 void Polyhedron_demo_mean_curvature_flow_skeleton_plugin::on_actionMCFSkeleton_triggered()
 {
+  dockWidget->show();
+  dockWidget->raise();
+
   const Scene_interface::Item_id index = scene->mainSelectionIndex();
 
   Scene_polyhedron_item* item =
@@ -358,36 +391,6 @@ void Polyhedron_demo_mean_curvature_flow_skeleton_plugin::on_actionMCFSkeleton_t
 
     if(!pMesh) return;
 
-    dockWidget = new QDockWidget(mw);
-    ui = new Ui::Mean_curvature_flow_skeleton_plugin();
-    ui->setupUi(dockWidget);
-    dockWidget->setFeatures(QDockWidget::DockWidgetMovable
-                          | QDockWidget::DockWidgetFloatable
-                          | QDockWidget::DockWidgetClosable);
-    dockWidget->setWindowTitle("Mean Curvature Flow Skeleton");
-    mw->addDockWidget(Qt::LeftDockWidgetArea, dockWidget);
-    dockWidget->show();
-    dockWidget->raise();
-
-    connect(ui->pushButton_contract, SIGNAL(clicked()),
-            this, SLOT(on_actionContract()));
-    connect(ui->pushButton_collapse, SIGNAL(clicked()),
-            this, SLOT(on_actionCollapse()));
-    connect(ui->pushButton_split, SIGNAL(clicked()),
-            this, SLOT(on_actionSplit()));
-    connect(ui->pushButton_degeneracy, SIGNAL(clicked()),
-            this, SLOT(on_actionDegeneracy()));
-    connect(ui->pushButton_run, SIGNAL(clicked()),
-            this, SLOT(on_actionRun()));
-    connect(ui->pushButton_skeletonize, SIGNAL(clicked()),
-            this, SLOT(on_actionSkeletonize()));
-    connect(ui->pushButton_converge, SIGNAL(clicked()),
-            this, SLOT(on_actionConverge()));
-    connect(dynamic_cast<Scene*>(scene), SIGNAL(updated_bbox()),
-            this, SLOT(on_actionUpdateBBox()));
-    connect(ui->pushButton_segment, SIGNAL(clicked()),
-            this, SLOT(on_actionSegment()));
-
     double diag = scene->len_diagonal();
     init_ui(diag);