Hi,
Example below using Ajax:
In client code:
<%@ Register Assembly="AjaxControlToolkit" Namespace="AjaxControlToolkit" TagPrefix="cc1" %>
<cc1:CollapsiblePanelExtender
ID="CollapsiblePanelExtender1"
runat="server"
CollapseControlID="Panel1"
Collapsed="true"
ExpandControlID="Panel1"
TextLabelID="Label1"
CollapsedText="+"
ExpandedText="-"
ExpandDirection="Vertical"
TargetControlID="panelPatientInfo"
ScrollContents="false">
</cc1:CollapsiblePanelExtender>
In your Code behind example:
CollapsiblePanelExtender1.Collapsed = false;
Hope this could help...
Remember to vote if could help...
Regards,