Multi layer gantt (planned and actual)

Is this Gantt chart possible to do a multi-layer like the image below? whether we should manually create a multi layer above and below task / planned and actual


Thanks.

It requires quite complicated coding with current version of the Gantt.
Starting from the next version ( September - October ) this will be available as default functionality.

I like all dhtmlx componem and design I will waiting for next version, Thank a lot.