| rect | 渲染 TreeView 的矩形。 |
这是 TreeView 的主要 GUI 方法，用于处理和绘制 TreeViewItems。
在应在给定 Rect 中渲染 TreeView 的位置调用此方法。如果 TreeView 是使用 MultiColumnHeader 构建的，则头会包括在提供的矩形中。
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