Since you are providing the data for the CheckList
Filtering functionality within the server-side FilterCheckListItemsRequested
event, it is not possible to retrieve the changes that you have made on the client-side.
The only thing that I could suggest for achieving such requirement is to force the user to save the changes in the grid before the CheckList Filterting
is used. Thus will allow you to have to correct data within the FilterCheckListItemsRequested
Hope this helps.