[vtkusers] how to destroy vtkRenderWindow out from the screen

[Martin Petrek]

Hi all,
Please, can anyone advise me, how to unmap vtkRenderWindow from the screen?
I'm doing some interactive tool for visualizing, where I need to 
show/hide window
on the screen according user's commands.  

                                                            Thanks a lot
-- Martin



Using VTK 4.0, LINUX RH7.2


vtkRenderWindow *renWin = vtkRenderWindow::New();
..
renWin->Render();
..
renWin->  ???                 //    keep window off the screen?