public void ShowPropertiesFor(UML.MultiplicityElement element)
 {
     _multiplicityElement = element;
     _orderedViewer.ShowPropertyValueFor(element);
     _uniqueViewer.ShowPropertyValueFor(element);
     _lower.Text = element.Lower.ToString();
     _upper.Text = element.Upper.ToString();
 }
 public new void Hide()
 {
     _multiplicityElement = null;
     base.Hide ();
 }