Hi Giovanni,

You can easily expand a treegroup using the expanded property or by using the expandItem Method (have a look at the API here)

In the demo below, you can see an example of a programmatically expanded treegroup (“Attractions”) and a group expanded by the expanded property(“Dining”): demo of expanded

If you have any other questions, please do not hesitate to contact us again!
Best regards,
Ivan Peevski
Smart UI Team