I'm playing around with Grid View 2008 and grouping, maybe I didn't understand the concepts yet but these are some of the problems I have:
After setting up the GridView with pre-set grouping, if the User changes the grouping, there are no longer any default group headers.
When loading directly from a Database Reader like this:
Grouping does not work correctly.
After playing around with grouping, especially when placing two columns on the same level in the group panel, the group headers suddenly do no longer display correctly
When dragging a column from the group panel back to the header area, its size is extremely small and difficult to resize
Filtering does not work when grid is read only.
Context menu shows impossible tasks like "edit", when the grid is read only.