How to change datatable's data in ActiveContent ?

Hi, please help me to do that, thanks!

http://webix.com/snippet/004e131a

Sorry, but it will not work in this way. ActiveContent works for simple static views, such as form controls, but it will not work for complex components such as datatable.

OK, thanks for you answer. Is there a way to add datatable to tree node? or datatable in datatable?

Unfortunately, there is no such possibility.
You can use TreeTable, but it will have a single shared header for all levels of data.