Tree column can't be multiline?

Hello-- I have my treegrid set to allow multiline, and all columns seem to allow this except the first one, where I have the tree controls. Is there something special I should do to allow that one to also be multiline?

This blocked by hardcoded syles, you can update dhtmlxTreeGrid.js to allow multiline, but it may cause some visual problems

dhtmlxTreeGrid.js, line 412


just remove marked part of code line