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stevefred-5067 asked HuiLiu-MSFT edited

PRISM Navigation at start up fails

I am not sure this where to ask this question
I am using PRISM 8.0 cire
At startup I try to navigate to a view to a region and it fails.
I the navigation right after the InitializeComponent method

 public partial class MainWindow : ThemedWindow
     public MainWindow()
         var mv = DataContext as MainWindowViewModel;

public void NavigateToToolbar()
_regionManager.RequestNavigate(RegionNames.NavigationBarRegion, "ToolbarWindow", NavigationCompleted);

     private void NavigationCompleted(NavigationResult result)
         var a = 1;

Can anyone tell me why this would fail?
The ToolbarWindow is registered for navigation with the container

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