private void ComboBox_SelectionChanged(object sender, SelectionChangedEventArgs e)
        {
            string type = "";

            if (type == "NormalELSRedemEvent")
            {
                UserControl ctrl = new StepDownEarlyRedemEventCtrl();
                ctrl.DataContext = new StepDownEarlyRedemEventCtrlViewModel();
                this.EventDetailCtrl_.Children.Add(ctrl);
            }
        }
        private void ComboBox_SelectionChanged(object sender, SelectionChangedEventArgs e)
        {
            string type = "";

            if (type == "NormalELSRedemEvent")
            {
                UserControl ctrl = new StepDownEarlyRedemEventCtrl();
                ctrl.DataContext = new StepDownEarlyRedemEventCtrlViewModel();
                this.EventDetailCtrl_.Children.Add(ctrl);
            }
        }