protected virtual void InitEdgeConnector(IEdgeConnectorListener listener)
 {
     dragHelper = new BaseEdgeDragHelper(listener);
     activators.Add(new ManipulatorActivationFilter {
         button = MouseButton.LeftMouse
     });
 }
 public BaseEdgeConnector(IEdgeConnectorListener listener) : base()
 {
     dragHelper = new BaseEdgeDragHelper(listener);
     active     = false;
     activators.Add(new ManipulatorActivationFilter {
         button = MouseButton.LeftMouse
     });
 }