LabelDataColumns needs to scroll column to visible when question clicked on
If a response item is selected, the column assigned to that item is selected; but if that column is not visible in the scroll pane, it is not shown.
Also, if we've selected a column and the next columns are not visible, then we should automatically scroll for them (maybe)
To address my comment from May 8 2008, I've made it so that when a column is assigned, it is scrolled to the left edge of the viewport.
Current implementation is that auto-scroll only happens when the column to the right of the currently selected column is not visible. Then the currently selected column is scrolled to the left of the window.
Original Bugzilla ID was 3284
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