[vtkusers] How to enable vtkButtonWidget's LeftButtonPressEvt event in .net

[louiskoo]

Below is my code:
  vtkTexturedButtonRepresentation2D rep =
vtkTexturedButtonRepresentation2D.New();
            
            rep.SetNumberOfStates(2);
            rep.SetButtonTexture(0, imageData1);
            rep.SetButtonTexture(1, imageData2);
            rep.SetPlaceFactor(1);

            double[] position = new double[3] { 1, 1, 1 };
        
            IntPtr p0 = Marshal.AllocHGlobal(Marshal.SizeOf(typeof(double))
* 3);
            Marshal.Copy(position, 0, p0, 3);

            double[] orientation = new double[3] { 1, 1, 1 };
            IntPtr p1 = Marshal.AllocHGlobal(Marshal.SizeOf(typeof(double))
* 3);
            Marshal.Copy(orientation, 0, p1, 3);
            vtkRenderWindow renderWindow = vtkRenderWindow.New();
            vtkRenderWindowInteractor renderInteractor =
vtkRenderWindowInteractor.New();
            renderInteractor.SetRenderWindow(renderWindow);

            vtkButtonWidget buttonWidget = vtkButtonWidget.New();
            //buttonWidget.ProcessEventsOn();
            buttonWidget.SetInteractor(renderInteractor);
            buttonWidget.SetRepresentation(rep);
            //buttonWidget.AddObserver()
            buttonWidget.SetEnabled(1);

           
            renderWindow.Render();
          
            vtkWidgetEventTranslator widgetEventTranslator =
buttonWidget.GetEventTranslator();
            vtkEvent eventNew = vtkEvent.New();
            //eventNew.AnyEvt += new
vtkObject.vtkObjectEventHandler(eventNew_AnyEvt);
            widgetEventTranslator.SetTranslation(eventNew, 0);
            renderWindow.Render();
            renderInteractor.Initialize();
            buttonWidget.On();
            renderInteractor.Start();


First , below is invalid and I don't know why .
 buttonWidget.LeftButtonPressEvt+=new
vtkObject.vtkObjectEventHandler(buttonWidget_LeftButtonPressEvt);

Anyone can give me some idea?



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