[vtkusers] vtkImageViewer2 SetSlice without render

[Jonathan Morra]

I have a vtkImageViewer2 that I am changing the slice through using the
SetSlice(int) method.  I have a situation where I do not want to call
Render() during the SetSlice() method.  Is there anyway to either
1.  Ignore render events temporarily
2.  Set the slice without rendering.

Thanks
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