private void CreateViews()
 {
     if (currentWindow != null)
     {
         currentWindow.listView       = new ListView();
         currentWindow.graphView      = new GraphView();
         currentWindow.propertiesView = new PropertiesView();
     }
     else
     {
         currentWindow = (TreeEditorWindow)EditorWindow.GetWindow <TreeEditorWindow> ();
     }
 }
 public static void ShowTreeEditorWindow()
 {
     currentWindow = (TreeEditorWindow)EditorWindow.GetWindow <TreeEditorWindow> ();
 }