[vtkusers] How to control Window and level?

[John Mosso]

Greetings.

I'm trying to control window and level of an image. 

Basically I'm doing:
m_InteractorStyleImage = vtkInteractorStyleImage::New();
m_RenderWindowInteractor->SetInteractorStyle(m_InteractorStyleImage);
 
where m_RenderWindowInteractor is vtkWin32RenderWindowInteractor

zoom and rotations seems to work just fine but none window/level seems to take place using left key mouse. 
What am I missing ?? is there any other way to control window/level??

Thank you.
John Mosso.
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