如何在xamarin mvvmcross中为我的按钮创建一个"ontouch“事件？

private MvxCommand _buttonTouchCommand;
public IMvxCommand ButtonTouchCommand
{
    get
    {
        _buttonTouchCommand = _buttonTouchCommand ?? new MvxCommand(DoButtonTouch);
        return _buttonTouchCommand;
    }
}

private void DoButtonTouch()
{
    // 在这里处理按钮的"ontouch"事件
}

<Button
    android:id="@+id/myButton"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:text="My Button"
    local:MvxBind="TouchCommand ButtonTouchCommand" />