Silverlight：两次处理同一事件

Question

我有一个自定义控件，其中我有一个Storyboard类型的私有字段。我在两个不同的地方处理这个故事板的Completed事件，这引起了各种各样的问题。 Refer to this question for details of the problem.

所以我的问题是，是否还有另一种更好的方法，以避免一起使用，或者我是否可以采取措施防止它导致问题。

更新

以下是我正在谈论的代码......我添加了评论以确定我正在处理Completed事件的地方两次。

internal class MockButton : Button
{
    #region Fields

    private Storyboard _mouseEnterStoryBoard;
    private Storyboard _mouseLeaveStoryBoard;
    private Double _width;

    #endregion

    #region Properties

    internal Int32 Index { get; private set; }

    #endregion

    #region Ctors

    internal MockButton(Int32 index) : this(index, 200)
    {

    }

    internal MockButton(Int32 index, Double width)
    {
        this.Index = index;
        this._width = width;
    }

    #endregion

    #region Event Handlers

    internal void OnMouseEnter(Action action, Double targetAnimationHeight)
    {
        if (_mouseEnterStoryBoard == null)
        {
            _mouseEnterStoryBoard = new Storyboard();
            DoubleAnimation heightAnimation = new DoubleAnimation();
            heightAnimation.From = 10;
            heightAnimation.To = targetAnimationHeight;
            heightAnimation.Duration = new Duration(TimeSpan.FromMilliseconds(300));
            _mouseEnterStoryBoard.SetValue(Storyboard.TargetPropertyProperty, new PropertyPath("Height"));
            Storyboard.SetTarget(heightAnimation, this);
            _mouseEnterStoryBoard.Children.Add(heightAnimation);
        }

        //HERE
        _mouseEnterStoryBoard.Completed += (s, e) =>
        {
            action.Invoke();
        };
        _mouseEnterStoryBoard.Begin();
    }

    internal void OnMouseLeave()
    {
        if (_mouseLeaveStoryBoard == null)
        {
            _mouseLeaveStoryBoard = new Storyboard();
            DoubleAnimation heightAnimation = new DoubleAnimation();
            heightAnimation.To = 10;
            heightAnimation.Duration = new Duration(TimeSpan.FromMilliseconds(300));
            _mouseLeaveStoryBoard.SetValue(Storyboard.TargetPropertyProperty, new PropertyPath("Height"));
            Storyboard.SetTarget(heightAnimation, this);
            _mouseLeaveStoryBoard.Children.Add(heightAnimation);
        }
        if (_mouseEnterStoryBoard.GetCurrentState() != ClockState.Stopped)
        {
            //HERE
            _mouseEnterStoryBoard.Completed += (s, e) =>
            {
                _mouseLeaveStoryBoard.Begin();
            };
        }
        else
        {
            _mouseLeaveStoryBoard.Begin();
        }
    }

    #endregion
}