ApplicationBar WP7(ApplicationBar WP7)

 我想知道为什么当我加载我的Windows手机项目时，应用程序栏出现在我的第一个屏幕上，这只是一个加载背景.. 
 
 如何让它出现在加载的最后。 
 
 这是我使用的代码。 
 
public MainPage()
    {
        InitializeComponent();

        AnimationContext = LayoutRoot;  //  for page transitions
        _tappedListBox = null;   //  used for setting the activated ListBox on panorama for animation to map page

        // If the constructor has been called, this is not a page that was already in memory:
        _newPageInstance = true;

        //  Setup the background thread worker properties:
        _worker = new BackgroundWorker();   //  Create a background thread worker for downloading/installing park maps
        _worker.WorkerReportsProgress = true;
        _worker.WorkerSupportsCancellation = true;
        _worker.DoWork += new DoWorkEventHandler(worker_DoWork);
        _worker.ProgressChanged += new ProgressChangedEventHandler(worker_ProgressChanged);
        _worker.RunWorkerCompleted += new RunWorkerCompletedEventHandler(worker_RunWorkerCompleted);

        // Set the data context of the listbox control to the sample data
        this.DataContext = App.ViewModel;
        this.Loaded += new RoutedEventHandler(MainPage_Loaded);


    }
 
 我在这里设置了可见性。 
 
    private void MainPage_Loaded(object sender, RoutedEventArgs e)
    {
        if (!App.ViewModel.IsDataLoaded)
            App.ViewModel.LoadData();
        ;   //  load panorama data (if need to)

        if (!App.ViewModel.IsDataLoaded == false)
        {
            this.ApplicationBar.IsVisible = true;
        }
    }

I am wondering why when I load my windows phone project, the application bar is appearing on my first screen wich is just a loading background..
 
How can I make it appear at the really end of the loading.
 
This is the code I use.
 
public MainPage()
    {
        InitializeComponent();

        AnimationContext = LayoutRoot;  //  for page transitions
        _tappedListBox = null;   //  used for setting the activated ListBox on panorama for animation to map page

        // If the constructor has been called, this is not a page that was already in memory:
        _newPageInstance = true;

        //  Setup the background thread worker properties:
        _worker = new BackgroundWorker();   //  Create a background thread worker for downloading/installing park maps
        _worker.WorkerReportsProgress = true;
        _worker.WorkerSupportsCancellation = true;
        _worker.DoWork += new DoWorkEventHandler(worker_DoWork);
        _worker.ProgressChanged += new ProgressChangedEventHandler(worker_ProgressChanged);
        _worker.RunWorkerCompleted += new RunWorkerCompletedEventHandler(worker_RunWorkerCompleted);

        // Set the data context of the listbox control to the sample data
        this.DataContext = App.ViewModel;
        this.Loaded += new RoutedEventHandler(MainPage_Loaded);


    }
 
And i set the visibility here .
 
    private void MainPage_Loaded(object sender, RoutedEventArgs e)
    {
        if (!App.ViewModel.IsDataLoaded)
            App.ViewModel.LoadData();
        ;   //  load panorama data (if need to)

        if (!App.ViewModel.IsDataLoaded == false)
        {
            this.ApplicationBar.IsVisible = true;
        }
    }

原文：https://stackoverflow.com/questions/9686322