The user can output nested data items using special edition of dhtmlxGrid - dhtmlxTreeGrid. Additional JS file that should be added to the project is dhtmlxtreegrid.js . Look dhtmlxGrid manual to get details about grid structure initialization and usage.
Your opinion is important for us. Please feel free to contact us, say what for, where are you using treegrid, which methods are you using, what do you like, what don't like, what would you like to see in the future release. This information will help us to make dhtmlxTreeGrid better.
Thanks, your dhtmlxTeam.