static MainWindow ()
{
iconSourceTargetList.AddTargetEntry (DragDropTargets.PhotoListEntry);
iconSourceTargetList.AddTargetEntry (DragDropTargets.TagQueryEntry);
iconSourceTargetList.AddUriTargets ((uint)DragDropTargets.TargetType.UriList);
iconSourceTargetList.AddTargetEntry (DragDropTargets.RootWindowEntry);
iconDestTargetList.AddTargetEntry (DragDropTargets.PhotoListEntry);
iconDestTargetList.AddTargetEntry (DragDropTargets.TagListEntry);
iconDestTargetList.AddUriTargets ((uint)DragDropTargets.TargetType.UriList);
}