public void CreateConnection(IDiagramModel diagram, IDiagramConnectionPoint fromConnectionPoint, IDiagramConnectionPoint toConnectionPoint)
 {
 }
 public bool CanCreateConnection(IDiagramModel diagram, IDiagramConnectionPoint fromConnectionPoint, ConnectionDropTarget dropTarget)
 {
     return false;
 }
 public void CreateConnection(IDiagramModel diagram, IDiagramConnectionPoint fromConnectionPoint, IDiagramConnectionPoint toConnectionPoint)
 {
     throw new NotImplementedException();
 }