private void guio_MouseDown(object sender, System.Windows.Forms.MouseEventArgs e)
 {
     senderItem = HMIConstants.getGUIONumber(((System.Windows.Forms.Label)sender).Name);
     System.Windows.Forms.Label guio = (System.Windows.Forms.Label)sender;
     guio.DoDragDrop(guio, System.Windows.Forms.DragDropEffects.Move);
 }