[vtkusers] how to add user-defined message processing based on the \Examples\Medical\Cxx\Mecical3.c++

[diaoxianfen]

There are four view port in the render window.I want to add user-defined message to one of them,for exampe add LeftBottonDown Message to the axial image.I want to achieve the aim that when I press the left button of the mouse ,in the according view port will display the coordinates.I use the vtkMFCRenderView to be the base class of my view class.And I add the OnLButtonDown() message as follows.
void CMyView::OnLButtonDown(UINT nFlags, CPoint point) 
{
 // TODO: Add your message handler code here and/or call default
 
 //CView::OnLButtonDown(nFlags, point);

 vtkMFCRenderView::OnLButtonDown(nFlags,point);
}

But the result is not changed.What I get is still the vtkRenderWindowInteractor control style. I don't know what is the reason?Why it doesn't respond my defined message.
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