How to display AJAX PopupControlExtender and close it when clicked on any part of the page?

I am using  AJAX PopupControlExtender on my web page.
<asp:Panel ID="panel1" runat="server" CssClass="modalPopup" style="display:none;" >
//SOME TEXT//
</asp:Panel>
<ajaxtoolkit:PopupControlExtender runat="server"
PopupControlID="panel1"
id="PopupControlExtender1" OffsetX="50" OffsetY="15"
TargetControlID="linkButton1">
<asp:LinkButton ID="linkButton1" runat="server">Help</asp:LinkButton>

Right now, this code opens the popup when I click on the link button and closes immediately. I want it to display for some more time and when I click on any part of the page it should close.
How do I do that?
reach_prgmmerAsked:
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reach_prgmmerConnect With a Mentor Author Commented:
Is there a way I can actually get the popup not to close?
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informaniacCommented:
When u click on linkbutton it causes a poistback due to which the popup gets closed.
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reach_prgmmerAuthor Commented:
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