How to enable three state checkbox selection in Thingworx Advanced Grid

If I'm not mistaken, Thingworx is using DHTMLX controls and there is an option for when a checkbox is selected the parent and children nodes are also selected/deselected as needed. I am trying to get this to work but I don't see any option and my current solution is not economical (uploading data to sql server and reloading mashup and reloading the data from sql). I'd prefer to do this client-side or at the least on the Thingworx side. Any suggestions?

Click on the second grid's checkboxes to see how three-state checkboxes work.

https://dhtmlx.com/docs/products/dhtmlxTree/samples/02_checkboxes/05_tree_checkboxes.html