private void ViewModelChanged(object sender, DependencyPropertyChangedEventArgs e)
        {
            this.viewModel_ = this.DataContext as Excel_stepDownKICustomViewModel;

            this.IssueInfoGrid_.Children.Clear();
            this.IssueInfoGrid_.Children.Add(this.viewModel_.Excel_issueInfoViewModel_.view());

            this.UnderlyingInfoGrid_.Children.Clear();
            this.UnderlyingInfoGrid_.Children.Add(this.viewModel_.Excel_underlyingCalcInfoViewModel_.view());

            this.StepDownKICustomGrid_.Children.Clear();
            this.StepDownKICustomGrid_.Children.Add(this.viewModel_.Excel_hifive_StepDownKI_ViewModel_.view());
        }
        private void ViewModelChanged(object sender, DependencyPropertyChangedEventArgs e) 
        {
            this.viewModel_ = this.DataContext as Excel_stepDownKICustomViewModel;

            this.IssueInfoGrid_.Children.Clear();
            this.IssueInfoGrid_.Children.Add(this.viewModel_.Excel_issueInfoViewModel_.view());

            this.UnderlyingInfoGrid_.Children.Clear();
            this.UnderlyingInfoGrid_.Children.Add(this.viewModel_.Excel_underlyingCalcInfoViewModel_.view());

            this.StepDownKICustomGrid_.Children.Clear();
            this.StepDownKICustomGrid_.Children.Add(this.viewModel_.Excel_hifive_StepDownKI_ViewModel_.view());

            
        }