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rpkhareFlag for India

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How to collapse all the panels inside a repeater control

In my ASP.NET 3.5 web application, I have Web Form with a repeater control. Enclosed within the repeater control's ItemTemplate is Collapsible Panel Extender which binds a Panel Control somewhat in this way:
<asp:repeater ID="rpt1" runat="server">
             <cc1:CollapsiblePanelExtender id="cpe1" runat="server" TargetControlId="panel1>
              <asp:Panel id="panel1" runat="server">

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I have two buttons viz: Collapse and Expand. When I press Collapse, all panels must collapse inside the CollapsiblePanelExtender and when I press Expand, all panels must expand.

I tried little code like this on button click event:
Control ctl = new CollapsibleControlExtender.Controls[0];

CollapsiblePanelExtender cpe = new CollapsiblePanelExtender.FindControls("cpe1") as CollapsiblePanelExtender;

cpe.collapse = true;
cpe.ClientState = "true;

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The problem with this code is that if 5 panels are displayed inside repeater control then only 1 gets collapsed. I want all the panels to be collapsed and expanded on button clicks.
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Anil Golamari
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Thanks. But I have solved the problem the other way.