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Steps to reproduce

Quickly hover onto menu in Dropdown.Butt

感谢作者的辛苦更新。（Thanks to the author for the long update）
我的英文不好，我会采用双语的方式。（My English is poor, so I can speak two languages.）

PoisonMessageBoxControl.xml

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Container currently is being created out of div. We should make it compose of Box, so we have all the flexbox etc. properties.