Paul,

You code seemed fine. I would create a new simple page and test use a simple control that implements the postback and see if that works.

>>Hi Paul,
>>
>>Look in your HTML sent to the client and see if a __doPostBack is getting generated for your control. Your code should be executing.
>>
>
>I checked a bit earlier and it doesn't appear to be generating it; I also checked the WebUIValidation.js file just in case it was hiding in there. I'm not sure why it's not there. I also tried accessing the Page object from within my control, but Page is evaluating to null (I was tring to use Page.GetPostBackEventReference()). I don't know if the two are related.