public static void UpdateOverlayListSelection(Selection selection)
 {
     if (master != null)
     {
         foreach (TreeNode child in master.ItemList.Nodes)
         {
             var overlay = child.Tag as Overlay;
             child.Checked = selection.IsOverlaySelected(overlay);
         }
     }
 }
 public static void UpdateOverlayList(TourStop tourStop, Selection selection)
 {
     if (master != null)
     {
         master.ItemList.Nodes.Clear();
         if (tourStop != null)
         {
             foreach (var overlay in tourStop.Overlays)
             {
                 var item = new TreeNode(overlay.Name);
                 item.Tag = overlay;
                 item.Checked = selection.IsOverlaySelected(overlay);
                 master.ItemList.Nodes.Add(item);
             }
         }
     }
     // Hack to update Keyframer UI
     TimeLine.RefreshUi();
 }