private static void TextChangedCallback(DependencyObject d, DependencyPropertyChangedEventArgs e)
        {
            EditableLabel el = (EditableLabel)d;

            el.Text = e.NewValue as string;
        }
        private static void IsEditingChangedCallback(DependencyObject d, DependencyPropertyChangedEventArgs e)
        {
            EditableLabel el = (EditableLabel)d;

            el.IsEditing = (bool)e.NewValue;
        }