private void Window_KeyDown(object sender, KeyEventArgs e)
        {
            bool isLeftAltDown = Keyboard.IsKeyDown(Key.LeftAlt);
            bool isDeleteDown  = Keyboard.IsKeyDown(Key.Delete) || Keyboard.IsKeyDown(Key.Back);

            if (isLeftAltDown && isDeleteDown)
            {
                if (_contributionReport != null)
                {
                    _contributionReport.Cancel();
                }

                var window = Window.GetWindow(this);
                if (window != null)
                {
                    window.KeyDown -= Window_KeyDown;
                }
            }
        }