ModalPopupExtender not making Panel visible

Hi folks,

I have a popup Panel tied to a ModalPopupExtender (using ASP.NET AJAXToolkit Version 3.0.20229). If I don't set the Panel's style visibility:hidden, everything works fine. When I click the button that the ModalPopupExtender is tied to (TargetID), the Panel pops up. However, the problem is that onload, the Panel flashes on the screen momentarily. So I set the visibility:hidden but now, the ModalPopupExtender fires and the Panel is still invisible.

If I use server side code to set Panel1.Style.Add("visibility:visible") in the button's onclick event, it works but again, the Panel shows momentarily before being moved to the center of the screen.

Can anyone think of what I'm doing wrong? I do the same visibility:hidden "trick" on Popupcontrols with no issues.

Thanks in advance.Start Free Trial