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When I add a row to dhtmlxtreegrid using the addRowBefore api call, I would like to be able to control the style of the added row using a css class (so that it matches the style of the existing rows in the grid). How can I assign a "class" to the added row?

There is no direct way to do such action through JS API, you can set any css string through
    grid.setRowTextStyle(...

If you need to set exactly css class, you can use next workaround
   var new_row=grid.addRowBefore(....
   new_row.className="some_css_class";