[vtkusers] Grab Alt key

[Jesús Spí­nola]

Hi,

I want to know when the "Alt" key is pressed so I
use vtkRenderWindowInteractor::GetAltKey(), but it seems it only returns
true when "AltGr" is pressed. When I press "Alt" key, I always get false.
I tested under W7 x64.

Is that a bug or should I use another method?

Thanks in advance!

-- 
Jesús Spínola
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