Slice3DVWR Volume of Interest (VOI) bounds not updated via text boxes

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What steps will reproduce the problem?
1. When using the "Volume of Interest Extraction" widget in Slice3DViewer
2. Moving the bounding box widgets update the bounds displayed in the text box, 
but
3. changing the bounds in the text box does NOT update the extent widget or VOI

This is an important step when reproducing a VOI extraction from a different 
input volume, based on recorded bounds. Currently we have to manipulate the 
widget until the values match the desired values.

We would like the diplayed widget bounds to also respond to input numerical 
bounds (via the text box).

Original issue reported on code.google.com by [email protected] on 28 Nov 2011 at 2:55