[vtkusers] interactor and SetCapture() - how to turn it on?

[Mark Wyszomierski]

Hi,

I'm using vtkRenderWindowInteractor and
vtkInteractorStyleTrackballCamera on a windows platform. It seems like
left clicking in my scene and dragging the mouse around does not call
SetCapture() - as soon as the mouse pointer leaves the window frame,
interaction stops until the mouse moves back into the window. Is there
some flag that must be set to turn this on?

Thanks,
Mark