这个方案是用白色背景解决阴影问题，但当鼠标移入按钮上时，按钮背景会变成灰色，这时图标的白色底就显示出来了，有碍美观，你有解决的方案吗？
我想过通过鼠标移入、移出按钮的事件来解决，但似乎VSTO并没有提供这些事件。
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