private void Element_MouseDown(object sender, MouseEventArgs args)
 {
     if (args.Button == MouseButtons.Right)
     {
         (sender as IElement).OpenSettings();
     }
     else if (args.Button == MouseButtons.Left && Form.ModifierKeys == Keys.Control)
     {
         (sender as IElement).TogglePins();
     }
     else
     {
         DragAndDropController.MouseDown(sender);
     }
 }
 private void ButtonPK_MouseDown(object sender, MouseEventArgs e)
 {
     DragAndDropController.MouseDown(sender);
 }