ModalPopupExtender closing as soon as it opens

Question

Hi,

I'm trying to use the AjaxToolkit's ModalPopupExtender, but it doesn't work. In fact, as soon as it opens, it's getting closed. So I can see that it is rendered, but it's getting closed in the second.

I tried that with IE6 and Firefox 3, it does the samething.

Here's the code:

<AjaxControlToolkit:ModalPopupExtender ID="ModalPopupExtender1" TargetControlID="ButtonTarget" PopupControlID="Panel1" OkControlID="ButtonOk" CancelControlID="ButtonCancel" BackgroundCssClass="modal-background" runat="server">
</AjaxControlToolkit:ModalPopupExtender>

<asp:Panel ID="Panel1" Style="display: none;" runat="server">
<%-- some stuff... --%>
</asp:Panel>

Answer 1

Hi Fred,

Use update panel for that work because when you click button it take also post back so thats why you just see the popup and it close on same time.

Answer 2

Yes, it really usefull, thanks for saving my time :D btw i think we also use 'UpdateMode="Conditional"' properties to make it works.

Great job Ali :)