private async void WMIClassComboBox_SelectionChanged(object sender, SelectionChangedEventArgs e) { try { string wMIClassName; if (((ComboBox)e.Source).SelectedValue == null) { wMIClassName = string.Empty; ModelView.DisableExtraTabs(); return; } wMIClassName = ((ComboBox)e.Source).SelectedValue.ToString(); bool collected = false; collected = await ModelView.SelectWMIClassName(wMIClassName); if (collected) { WMIPropertiesDataGrid.ItemsSource = ModelView.WMIProperties; } else { WMIPropertiesDataGrid.ItemsSource = null; } } catch { WMIPropertiesDataGrid.ItemsSource = null; } }