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If you try to use the update panel in Sitefinity and check Include Script Manager setting in page properties you will run into a little problem. Apparently, the update panel control expect to have registered a script manager on the page during the execution of OnInit method. This is a little problem because there is no way to know if there is a script manager added on the page's markup before OnInit method unless you search all the hierarchy of the controls on this page. As you can imagine this could slow down the page request execution. One of the possible solutions could be modifying a little the Update panel like this :
public class SitefinityUpdatePanel : UpdatePanel
protected override void OnInit(EventArgs e)
this.Page.InitComplete += new EventHandler(Page_InitComplete);
void Page_InitComplete(object sender, EventArgs e)
Then all you need is to replace update panel usages with the new one and all should work like a charm.
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