<cc1:CollapsiblePanelExtender ID="CollapsiblePanelExtender1" runat="server" 
 TargetControlID="Panel2" Collapsed="True" ExpandControlID="Label1" 
 CollapseControlID="Label1" 
 CollapsedText="[Click to expand]"
 ExpandedText="[Click to collapse]" 
 TextLabelID="Label1">
</cc1:CollapsiblePanelExtender>
