>Note: SP2 has a bug where tooltips don't appear in grids. We had to downgrade to SP1, since this is essential functionality in our app. The tooltips are multi-line descriptions of sku and quantity, and change with each line. They are used quite often by users as a double-check while in that particular grid. >
AFAIK downgrading was not necessary, there is a workaround in SP2 to show tooltips. Not sure if that is this one but I tested it once and it was working.
