被一个复合控件包含的控件。
附加属性很有用，因为它让父面板可以扩展其中包含的控件的属性集。
Attached properties are useful as they allow a parent panel to extend the property set of a control contained within it.
StackPanel是一种简单的布局面板，它支持用行或列的方式来定位其中包含的控件。
The StackPanel control is a simple layout panel that supports positioning its contained controls in either a row or column layout.
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