static DependencyObject FindDragLeaveCommandHolder(DependencyObject originalSource)
        {
            var element = originalSource.FindParent <DependencyObject>(t =>
            {
                return(DragDropManager.GetOnDragLeaveCommand(t) != null);
            });

            return(element);
        }
        static ICommand FindDragLeaveCommand(DependencyObject originalSource)
        {
            var element = DragDropManager.FindDragLeaveCommandHolder(originalSource);

            if (element != null)
            {
                return(DragDropManager.GetOnDragLeaveCommand(element));
            }

            return(null);
        }