In our grid, the master table view has a detailed table view. So for each row in the master table, there is a detailed table. When expanding the detailed table, the background color in some cells of the parent item will be changed based on some logic in the ItemDataBound event handler. My question is, is it possible to change the background color in the parent cells when collapsing a detailed table? I tried in ItemCreated event handler but got no luck. Looks like it is always using the viewstate to render the grid. Any thoughts? Thanks a lot!