How to enable three state checkbox selection in Thingworx Advanced Grid

Question

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

PaiChung · Answer

I don't remember that option being available for the adv. tree widget. I think maybe if multi-select is available, you can build some logic that triggers on a selection that refreshes the data so that a full branch is 'selected items'

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