Windows 8.1 Keep focus on TextBox - xaml

Question

For a Windows Store App a requirement says : "Keep the focus on a TextBox when the page is loaded and after user interact with others components".
I solved the Issue when the page is loaded and when the user interact with other components in the same Grid (i.e. Buttons).
MyTextBox.LostFocus += (s,e)=> {
Dispatcher.RunAsync(
CoreDispatcherPriority.Normal, () => SearchBox.Focus(FocusState.Programmatic));
}
The problem is that when when the user interact with components in different view , like the AppBar.
Maybe i can solve the issue comparing the parent views and run the Focus(FocusState.Programmatic) if they are coming from the same view.
But... how ?

Answer 1

Based on your description, you want to keep focus on TextBox. I do a simple demo and you can refer to this.
XAML：
<Grid Background="{ThemeResource ApplicationPageBackgroundThemeBrush}">
<StackPanel HorizontalAlignment="Center" VerticalAlignment="Bottom">
<TextBox x:Name="textbox1" Width="300" Height="50" HorizontalAlignment="Left" VerticalAlignment="Bottom"></TextBox>
</StackPanel>
<CommandBar>
<AppBarToggleButton Icon="Shuffle" Label="Shuffle" Click="AppBarButton_Click" />
<AppBarToggleButton Icon="RepeatAll" Label="Repeat" Click="AppBarButton_Click"/>
<AppBarSeparator/>
<AppBarButton Icon="Back" Label="Back" Click="AppBarButton_Click"/>
<AppBarButton Icon="Stop" Label="Stop" Click="AppBarButton_Click"/>
<AppBarButton Icon="Play" Label="Play" Click="AppBarButton_Click"/>
<AppBarButton Icon="Forward" Label="Forward" Click="AppBarButton_Click"/>
<CommandBar.SecondaryCommands>
<AppBarButton Icon="Like" Label="Like" Click="AppBarButton_Click"/>
<AppBarButton Icon="Dislike" Label="Dislike" Click="AppBarButton_Click"/>
</CommandBar.SecondaryCommands>
<CommandBar.Content>
<TextBlock Text="Now playing..." Margin="12,14"/>
</CommandBar.Content>
</CommandBar>
</Grid>
Code Behind:
public MainPage()
{
this.InitializeComponent();
this.LayoutUpdated += MainPage_LayoutUpdated;
}
private void MainPage_LayoutUpdated(object sender, object e)
{
textbox1.Focus(Windows.UI.Xaml.FocusState.Programmatic);
}
I also find one threads you can refer to.