private bool SummaryInUse()
    {
        bool retVal;

        if (ViewState["SummaryInUse"] == null)
        {
            retVal = WebCommon.ControlTypeExists(this.Parent.Page, typeof(System.Web.UI.WebControls.ValidationSummary));
            ViewState["SummaryInUse"] = retVal;
        }
        else
        {
            retVal = (bool)ViewState["SummaryInUse"];
        }
        return(retVal);
    }