I have a radgrid that uses a usercontrol as its edit form and in that user control i have a few drop down lists. In the usercontrol I try to insert a list item into one of my ddl's after it is databound and it adds successfully. When the prerender event fires for that DDL the inserted item disappears. I double checked to make sure the DDL was not getting rebound which it was not. I've noticed this before and my work around is to insert the item in the ddl prerender function and then everything works fine. I only have this issue with dropdowns that are in grid user control edit forms. Any thoughts?