private void OnDragDelta(object sender, DragDeltaEventArgs e)
 {
     if (TxtPrDescription.Visible)
     {
         TxtPrDescription.Hide();
     }
 }
 private void OnDragCompleted(object sender, DragCompletedEventArgs e)
 {
     if (PrDescExpander.IsExpanded)
     {
         TxtPrDescription.Show();
         TxtPrDescription.Height += (int)e.VerticalChange;
     }
 }