how to create event for child grid template

Hi Dess,

Thank you very much  for the solution.

I have a three level gridview. I have select All  header checkbox in the three levels and I am using KB article. My requirement is : To access the header row of the corresponding child and grand child  templates and change their toggle state if the sender is the parent header checkbox (if the Parent gridview header check box is checked/Unchecked).What is the correct event to handle these functions

Can we do the above mentioned things in the checkbox_toggleStatechanged event. 

Thanks,

Swarupa