[vtkusers] Separating VTKWindow

[John Biddiscombe]

>
>But, after I call vtkRenderWindowInteractor iren->Start () the program
>hangs and I cannot get back to the command line utility. I tried making

You'll have to hook into the message handling code and ensure that when you 
press a "certain" key (such as q or e) the message proc stops intercepting 
messages and hands them back to the old message handler. Look at 
vtkWin32RenderWindow and the interactor interface (i think from memory) and 
you can see how the window allows a hook to be inserted. To close it during 
operation like an on off switch will be a bit tedious, but ought to be 
strightforward....

JB