I am afraid that the reason for the experienced issue is the fact that the nodes in ServerSideCallBack
expand mode are not yet loaded, until the parent one is expanded. This mode is purposed for loading time optimization which is why the child are not loaded, until the parent is expanded. This is the reason why no reference is acquired using the findNodeByValue
and hence the "could not call expand of null."
error is encountered.
If you need to achieve the desired functionality, you would need to avoid using the aforementioned expand mode. You can test the behavior, using ServerSide
expand mode for example.
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