I have a grouped grid, with AllowMultiSelect set to false. If I select a visible item, i.e. in a group that is expanded, then select another, the original item is unselected, as expected. However, if I select an item, collapse the group that it resides in, and select an item from another expanded group, I am seeing 2 selected items in the SelectedIndexChanged event. If I expand the original group, I see both the original item and the newly selected item are both selected in the grid. Is that by design? For now I will try to code around it.