Hi, I did not find how to add items programmatically in jqwtree componente to populate it
The complete list of jqxTree functions is here:
I see methods like addBefore, addAfter and addTo.
jqwidget tree in nsb does not have these methods:

We don’t put them all in - on many of these, there would be a scary number of options. They are still usable, however.
If it is not wrapped/included from AppStudio, you can still alter the attribute with a $ jQuery statement. Give it a try.