Include FooterItems when determining SelectedItem.

Fixed #4578.

code/TemplateStudioForWinUICs/Templates/_comp/MT/Project.NavView.AddNavViewItem.Settings/ViewModels/ShellViewModel_postaction.cs

@@ -7,6 +7,7 @@ public class ShellViewModel : ObservableRecipient
     {
         IsBackEnabled = NavigationService.CanGoBack;
 //{[{
+
         if (e.SourcePageType == typeof(Param_ItemNamePage))
         {
             Selected = NavigationViewService.SettingsItem;

code/TemplateStudioForWinUICs/Templates/_comp/MT/Project.NavView/Services/NavigationViewService.cs

@@ -45,7 +45,7 @@ public class NavigationViewService : INavigationViewService
     {
         if (_navigationView != null)
         {
-            return GetSelectedItem(_navigationView.MenuItems, pageType);
+            return GetSelectedItem(_navigationView.MenuItems, pageType) ?? GetSelectedItem(_navigationView.FooterMenuItems, pageType);
         }
 
         return null;