private void _treeViewFolderBrowser_KeyUp(object sender, KeyEventArgs e)
 {
     switch (e.KeyCode)
     {
     case Keys.F5:
         if (_treeViewFolderBrowser.SelectedNode == null)
         {
             return;
         }
         TreeNodePath node = (TreeNodePath)_treeViewFolderBrowser.SelectedNode;
         node.Refresh();
         e.Handled = true;
         break;
     }
 }