An intermediate component can declare that it is the "host" component.
一个中层的组件可以声称它自己是“宿主”组件。
Note that Flex doesn't add a component directly to this list; several intermediate steps occur before that happens.
注意,Flex 没有向这个列表直接添加组件;在这发生之前需要经过几个中间步骤。
A further check is made to ensure that the component is an intermediate container (for example, an XUIPanel) and that the intermediate container fits within the XUIWindow's grid of rows and columns.
下面进一步检查以确保以下两点:该组件是一个中级容器(比如XUIPanel);这个中级容器能够包含在XUIWindow的行列网格中。
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