[vtkusers] Interacting with several renderer in one window

[Bartosz Wiklak]

Hello,

I have one window (vtkRenderWindow), and several renderers (vtkRenderer).
Each renderer has his own viewport and all are disjoint.
How can I interact with those renders, sent events from all of them to
my callback class and Render their interactors.

thx,
Bartek