void OnDragRecordOver(object sender, DragRecordOverEventArgs e)
 {
     if (e.IsFromOutside && typeof(Employee).IsAssignableFrom(e.GetRecordType()))
     {
         e.Effects = DragDropEffects.Move;
         e.Handled = true;
     }
 }
        private void OnDragRecordOver(object sender, DragRecordOverEventArgs e)
        {
            if (e.IsFromOutside && typeof(IUserScript).IsAssignableFrom(e.GetRecordType()))
            {
                e.Effects = DragDropEffects.Move;
            }

            e.Handled = true;
        }