How to set focus to an element inside of user control on UWP?

Question

I created my own UserControl, inside of it, I placed a ListView. But When I set the UserControl to show, I can't set focus to ListViewItem. The Focus is still in the original page.

For how to show my UserControl, I use Popup.

Popup popup = new Popup();
popup.Child = this;
popup.IsOpen = true;

Answer 1

Setting a Focus for a ListView takes place when the ListView has been loaded into the visual tree and ready for interaction.

We assume that you have created a UserControl that contains a ListView, then the method for setting the Focus for the ListView should be done in the UserControl_Loaded or ListView_Loaded event.

public PopupControl()
{
    this.InitializeComponent();
    // Data init
    var _popup = new Popup();
    _popup.Child = this;
    _popup.IsOpen = true;
}

private void UserControl_Loaded(object sender, RoutedEventArgs e)
{
    TestListView.Focus(FocusState.Keyboard);
}

Best regards.