Hi Cori
I've used XmlFormView Inside an UpdatePanel, It's raised error, but when I've used it inside RadAjaxPanel, It doesn't raised any error. Infopath form was loaded and everything was ok, but when I use asp button and the page is postback , the infopath form was disappeared, I want to know whether there is a problem with my page or XmlFormView Doesn't work inside RadAjaxPanel?
As Cory says, if InfoPath XmlFormView not work in Microsoft update panel, it will not work in radajaxpanel (the telerik ajax panel is upgraded version of update panel). You should ask M$ why oh why.