[vtkusers] Render widnow of vtkContextView object does not have WindowId()

[Xiaofeng Z]

Hi, I'm experimenting with vtkChartXY.  I tried to set the window size from outside vtk by calling MoveWindow API function on the HWND.  But the HWND returned from GetWindowId, see the code below, is null.  Is this a bug?
 
vtkSmartPointer<vtkContextView> view = 
vtkSmartPointer<vtkContextView>::New();
view->GetRenderer()->SetBackground(1.0, 1.0, 1.0);
vtkWin32OpenGLRenderWindow* win = vtkWin32OpenGLRenderWindow::SafeDownCast(view->GetRenderWindow());
HWND hwnd = win->GetWindowId();

Thanks!
Xiaofeng Z

 		 	   		  
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