我在项目里用到了TreeGrid,但是无法显示子节点,vaadin 版本 8.6.3

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项目之前用的vaadin 7,后来升级到vaadin 8+兼容包

I use TreeGrid component in my code,but only parent nodes show.
The Project used Vaadin 7 before and use Vaadin 8 + Compatible package currently.