TreeGridGroupConnector Group Order

Is there a way to control the order of the grouped Items. I have Group names like Event 1 (type) thru Event 16 (type) and the order is Event 1, Event 10, Event 11, Event 2, Event 3 and so on…

I need to sort them in order by a numeric field but display the event name field in the tree

Is this possible if so how to accomplish this?

Unfortunately it is not possible. The group labels are always rendered by the text label.
If this is a critical requirement - you can try to change get_variants logic in the db_common.php

Where would I find this in the java connector?

I found it in the DBDatawrapper thank you