[vtkusers] problem about vtkvtkCallbackCommand

[王斌]

hello vtkusers
	i write a program to test the vtkCallbackCommand class.but the CallBackProc function did not happen.
i don't know why.any advice are what i want, thanks in advance.
    void main()
{
	vtkCallbackCommand *CallBackCm=vtkCallbackCommand::New();
	vtkRenderer *aRenderer=vtkRenderer::New();
	vtkRenderWindow *renWin=vtkRenderWindow::New();
	renWin->AddRenderer(aRenderer);
	vtkWin32RenderWindowInteractor *iren=vtkWin32RenderWindowInteractor::New ();
	iren->SetRenderWindow(renWin);

	CallBackCm->SetCallback (&CallBackProc);
	iren->AddObserver (vtkCommand::LeftButtonPressEvent,CallBackCm);
	renWin->Render();
	iren->Start();
}

void CallBackProc(vtkObject *object,unsigned long msg,void* ,void* )
{

	MessageBox(NULL,"LeftButtonPressEvent happen","congraduation",MB_OK);
	
}


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