I have a master-detail grid and I've enabled column resizing.
I've noticed that when a column resize event is triggered on the master grid (i.e. the one that contains the expand/collapse HierarchyCells), the index field returned from this event is out by 1 when compared to the columns field in the same event. The index is too large by 1.
When a column resize event is triggered on a grid that does not contain HierarchyCells, the index field returned is correct.
In the attached files, you'll see the address1 column was resized, however, an index of 5 was returned instead of 4.