[vtkusers] key board event

[Hoang Hoang]

hi all,
 I am writing a window appication which requires keyboard interaction. I
have used the methods
vtkRenderWindowInteractor->AddObserver(eventId,command) which can catch
keyboard events (press or release). The problem is the same action is taken
for every key. How can I specify action for an invidual key?
Thank you.
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