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Using a tree with three state checkboxes enabled, when one clicks on a parent node with a check box, and it's child nodes are automatically checked, the onCheckHandler event does not get called for the nodes that automatically get checked. The node check handler only gets called when the user physically checks a node.

This is a correct behaviour. The changing of checkbox state, caused by changing state of parent/child item, doesn't fire onCheck event. It was done in such way to prevent plural calls, which can be a serious performance problem for big trees.

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