WPF tab order with custom controls?

Question

I have a WPF page that contains several out of the box controls with the tab order set.

I have a custom control (NumericSpinner) that contains: border/grid/text box/

Answer 1

HaxElit's answer works unless we want to use labels to focus our control by Alt + hotkey like this:

Elements _Count:

So my final solution is as follows:

static NumericSpinner()
{
    // Next line prevents focusing our wrapper parent control. The problem with that is that
    // it prevents Label controls to select our control by Alt+
    //FocusableProperty.OverrideMetadata(typeof(NumericSpinner), new FrameworkPropertyMetadata(false));

    // Next line specifies that the children controls have their own tab subtree so a deep
    // traversal is performed when our control is focused
    KeyboardNavigation.TabNavigationProperty.OverrideMetadata(typeof(NumericSpinner), new FrameworkPropertyMetadata(KeyboardNavigationMode.Local));
}

// our wrapper control is focused invisibly. We must relocate the focus.
protected override void OnGotFocus(RoutedEventArgs e)
{
    base.OnGotFocus(e);

    // Next line moves the focus either forward (to out first inner child)
    // or backward if Shift+TAB is pressed (to the previous control)
    MoveFocus(new TraversalRequest(Keyboard.IsKeyDown(Key.Tab) && (Keyboard.Modifiers & ModifierKeys.Shift) != 0 ? FocusNavigationDirection.Previous : FocusNavigationDirection.Next));
}