protected void btnAddFilteredSet_Click(object sender, System.EventArgs e)
        {
            try
            {
                string levUN = Request.Form[this.UniqueID + ":selFilteredSetLevel"];
                string meaN  = Request.Form[this.UniqueID + ":selFilteredSetMeasure"];
                string op    = Request.Form[this.UniqueID + ":selFilteredSetOperator"];
                string val   = Request.Form[this.UniqueID + ":txtFilteredSetValue"];

                _contr.AddFilteredByMeasureSet(levUN, meaN, op, val);

                _report.SaveState();
            }
            catch (Exception exc)
            {
                ((PageBase)this.Page).ShowException(exc);
            }
        }