I am working with AJAX Panel Collapsable panel extender.
Script for AJAX Collapsible Panel Extender is as follow.
<ajax:CollapsiblePanelExtender ID="cpeSOP" runat="Server" CollapseControlID="pnlCollapsable"
CollapsedSize="0" Collapsed="True" CollapsedImage="~/public/img/arrowRightWhite.gif"
ExpandControlID="pnlCollapsable" ExpandDirection="Vertical" ExpandedImage="~/public/img/arrowDownWhite.gif"
ImageControlID="Image1" SuppressPostBack="true" TargetControlID="pnlSearchCriteria">
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