[vtkusers] a question about interacting in MFC application

[´÷˶]

hi,everyone
    I wrote a dialog-based MFC application with VC6. I want to 
display and interact with a vtkPolyData object in a picture box
(i could get the picture box's window by calling GetDlgItem()).
    My program displays quite well. But how can I interact with 
the polydata object by using vtkWin32RenderWindowInteractor?
    Any suggestions will be very appreciated.
                                              Daishuo
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