I'm using more or less the same code to create a checkbox in the CellItem instead of the Header.  It works fine the first time it renders, but on post back the checkbox is no longer accessible when I iterate through the rows of the grid, and disappears when the page renders after the post back. 

I put the code for inserting the checkbox in the OnInit event of the page, but it appears to behave the same as it did in OnLoad.   

Is the checkbox not getting stored in the ViewState for the UltraWebGrid?   If so, do I need to do something to ensure that it's state is maintained between post backs?