void CollapsiblePanelExtender_ClientStateValuesLoaded(object sender, EventArgs e)
{
var ctrl = this.FindControl(this.TargetControlID) as WebControl;
if(ctrl != null) {
if(!String.IsNullOrEmpty(base.ClientState)) {
var collapsed = bool.Parse(base.ClientState);
if(collapsed)
ctrl.Style["display"] = "none";
else
ctrl.Style["display"] = String.Empty;
}
}
}