I have a dynamic user control that has a radgrid inside it. The user control would always display the radgrid in edit mode on page load. Inside the radgrid, there is a radcombobox. There is a javascript in usercontrol itself for radcombobox OnSelectindexchanging event. What we need is to hide/display a row of the radgrid based on the combo box value by passing the row index which needs to be displayed/hidden. Problem is I am not able to access radgrid (or any control) from the usercontrol. I have attached the complete user control page. Please see cbo_OnSelectedIndexChanging function. Inside this method, we call HideRow(index) method. In hideRow, when we reference matertableview, it fails. Can anyone please help?