事件时，复选状态尚未更改。

Event is raised the check state has not yet changed.

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请注意：树中的每一个节点都包括一个复选框，它负责控制该元素的使动状态。

Notice that each node in the tree includes a check box that controls the enabling state of the element.

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例如，您可能想修改复选框和单选按钮所使用的图标以便绘出它们的状态，或者使用其他的图标来绘制文件夹和树组件的节点。

For example, you may want to modify the ICONS used by the check boxes and radio buttons to paint their status, or you may want to use other ICONS to paint the folders and nodes of a tree component.

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