I am dynamically registering an image button as the trigger for an update panel with the following code:

AsyncPostBackTrigger trigger = new AsyncPostBackTrigger();
trigger.ControlID = imgButton.UniqueID;
trigger.EventName = "click";
uxUplImageView.Triggers.Add(trigger);

This worked great.  However, I then set the same image button as the TargetControlID for a ModalPopupExtender.  This seems to kill the trigger. 

Does anyone have any ideas how to have the same button as both the trigger for an update panel, and also for a Modalpopup?

Thanks for any help

You could let the imagebutton postback and then call .Show() on the modalpopup from code behind to show the modal popup after the postback. However, you will need to have a dummy linkbutton defined as the targetcontrolid of the modal popup but this can have style="display:none;" assigned so that it is not visible on the page.

Jason

Thanks Jason - that should do the trick.