PopupListBox GetListBox() { return((PopupListBox)LayoutHelper.FindElement((FrameworkElement)PopupBaseEditHelper.GetPopup(customizationLayouts).PopupContent, IsListBox)); }
void OnCustomizationLayoutsPopupContentSelectionChanged(object sender, SelectionChangedEventArgs e) { PopupBaseEditHelper.GetOkButton(customizationLayouts).IsEnabled = GetListBox().SelectedItems.Count > 0; }