创建虚拟 TreeViewItem 列表。适用于重载 BuildRows 以防止构建完整项树的情况。
在 BuildRow 中构建行时，无需为折叠项的后代创建项，因为这些后代不可见。这是一项十分有用的优化，尤其在大型树或经常变化的树中。但是，折叠的项仍需要显示折叠箭头以表明存在子项。为此，需要创建一个虚拟列表并将其分配给折叠的父项 TreeViewItem 的 TreeViewItem.children 属性。
另请参阅：BuildRows。IsChildListForACollapsedParent。
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