void _editeActivity_Menu_Click(object sender, RoutedEventArgs e)
        {
            EditActivitiesUI editor = new EditActivitiesUI(this._host);

            editor.Owner         = this._host;
            editor.ShowInTaskbar = false;
            editor.ShowDialog();
            editor = null;
        }
        private static void _hostPropertyChanged(DependencyObject obj, DependencyPropertyChangedEventArgs args)
        {
            EditActivitiesUI createTrail = (EditActivitiesUI)obj;

            createTrail._host = (OSMDocument)args.NewValue;
        }