private void testSetNavigationTree_BeforeLabelEdit( object sender, NodeLabelEditEventArgs e )
{
//-------------------------------------------------------------------------------------//
//--- Do not allow folders to be renamed if they are not the root (project) folder. ---//
//-------------------------------------------------------------------------------------//
var di = e.Node.Tag as DirectoryInfo;
if (di != null && e.Node.Parent != null)
e.CancelEdit = true;
}