Oops. Button with Autopostback=true - Sorry this is a cut and past error. Please ignore. The button on the page is a regular submit which causes postback The page I am developing is much complicated than my example. I eliminated the other stuff to simplify the page and isolate the issue. I have a page dirty check mechanism in place on the page and it prompts the user with a Do you want to save changes? If the user clicks yes, a hidden field is set to yes which is checked by the page on postback. During postback the page calls Save on all its user controls in the RaisePostBack event if it sees a save=yes in the hidden field. To implement this scheme I need the page to be able to Raise the postback event when the postback happens because of a change in the dropdown. thanks