I have a modal popup. When i click on a button in this popup, another popup show up. But on the second popup, each time I click a button, the popup disappear, and I must click on the button of first modal popup to show it up again.I've already put a UpdatePanel inside Panel of popup control but it doesn't seem to work.More detail.I created 2 user controls, 1 for looking up and another for editing data.And I'm creating another 2 user control with modal popup inside.First modal popup: has a multi view with look up control and edit control.\[code\]<aspanel ID="panelMain"> <asp:UpdatePanel> <asp:MultiView> <asp:View> <Lookup Control> </asp:View> <asp:View> <Edit Control> // this edit control contains second modal popup </asp:View> </asp:MultiView> </asp:UpdatePanel></aspanel><ajax:ModalPopupExtender PopupControlID="panelMain" />\[/code\]Second modal popup: only has look up control.\[code\]<aspanel ID="panelMain"> <asp:UpdatePanel> <Lookup Control> </asp:UpdatePanel></aspanel><ajax:ModalPopupExtender PopupControlID="panelMain" />\[/code\]The look up control has button to search, etc and might trigger postback event.Is there anyway so I can prevent the second popup from closing after each click?Sorry for my bad english because it's not my mother language.Any ideas and suggestions are appreciated!Thanks!