WPF. TextBox focuses after losing focus

Question

Steps

• Subscribe TextBox focus events

_associatedObject.GotKeyboardFocus += OnAssociatedObjectGotKeyboardFocus;
_associatedObject.LostKeyboardFocus += OnAssociatedObjectLostKeyboardFocus;

_associatedObject.GotFocus += (s,e) =>
{
    System.Diagnostics.Debug.WriteLine("GotFocus");
};

_associatedObject.LostFocus += (s, e) =>
{
    System.Diagnostics.Debug.WriteLine("LostFocus");
};

_associatedObject.IsKeyboardFocusedChanged += (s, e) =>
{
    System.Diagnostics.Debug.WriteLine("IsKeyboardFocusedChanged");
};

_associatedObject.IsKeyboardFocusWithinChanged += (s, e) =>
{
    System.Diagnostics.Debug.WriteLine("IsKeyboardFocusWithinChanged");
};

• Raise LostFocusEvent after LostKeyboardFocus

private void OnAssociatedObjectLostKeyboardFocus(object sender, KeyboardFocusChangedEventArgs e)
{
    _associatedObject.RaiseEvent(new RoutedEventArgs(UIElement.LostFocusEvent));
    Keyboard.ClearFocus();
    System.Diagnostics.Debug.WriteLine("LostKeyboardFocus");
}

• Open the program and click on the TextBox;
• After the element has focus, click on the desktop, or in any other application, to remove focus from the TextBox element;
• Return focus to your application again.

Expectations

After focusing the window, nothing should be added to the debug window because the element has been LostFocus.

Result

IsKeyboardFocusWithinChanged
IsKeyboardFocusedChanged
GotKeyboardFocus
IsKeyboardFocusWithinChanged
IsKeyboardFocusedChanged
LostFocus
LostKeyboardFocus
LostFocus