RadWindow confirmation Box

[Dip]

I have been looking Every Where for the solution ...final I got the solution in
http://www.telerik.com/community/forums/aspnet/window/confirm-postback-dialog.aspx
 I followed the RadConfirmPrometheus.zip file to receive the result..

 

<asp:Button ID="AllianceDelete" runat="server" Text="Delete"

 

 

OnClientClick="return radconfirm('Delete Item?', event);" OnClick="AllianceDelete_Click" />
No problem so far ..Expected result received....

Now When I inlcude Ajax portion ...I get the the RadWindow, but clicking yes button on the RadWindow doesn't do a postBack ..why? 
Ajax Portion

 

<

telerik:RadAjaxManagerProxy ID="RadAjaxManagerProxy2" runat="server">

 

 

 

 

<AjaxSettings>

 

 

 

 

<telerik:AjaxSetting AjaxControlID="AllianceDelete">

 

 

<UpdatedControls>

 

 

 

 

<telerik:AjaxUpdatedControl ControlID="AllianceGrid" /

 

 

 

 

 

</UpdatedControls>

 

 

 

 

</telerik:AjaxSetting>

 

 

 

 

</AjaxSettings>

 

 

 

 

</telerik:RadAjaxManagerProxy>

Thanks,
DIP