荫庇 读音：yìn bì 解释：大树遮住炙人的阳光，旧时比喻尊长照顾着晚辈或祖宗保佑着子孙。覆盖、遮蔽；庇护、保护；也有旧时亦常指子孙凭借先辈的功勋而得到封赏之意。
I want to make an ItemsControl that provides some of its own children, and then when used can add additional children, similarly to the built in Expander class.
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