protected override void UpdateDisplayFilter(string displayFilter)
        {
            DisplayFilterEventArgs args = new DisplayFilterEventArgs(displayFilter);

            Properties.RaiseUpdateDisplayFilter(args);
            base.UpdateDisplayFilter(args.FilterText);
        }
        protected internal virtual void RaiseUpdateDisplayFilter(DisplayFilterEventArgs e)
        {
            UpdateDisplayFilterHandler handler = (UpdateDisplayFilterHandler)Events[_updateDisplayFilter];

            if (handler != null)
            {
                handler(GetEventSender(), e);
            }
        }