public DynamicConnectorProperties(DynamicConnector el) : base(el)
 {
     StartCap = el.StartCap;
     EndCap   = el.EndCap;
 }
 public DynamicConnectorProperties(DynamicConnector el) : base((GraphicElement)el)
 {
     StartCap = el.StartCap;
     EndCap   = el.EndCap;
 }