Overlapping sub-task of Gantt chart

Question

Is there any way I can overlap the sub-tasks of Gantt chart?

Currently, the first sub-task is shrinked to end just when second sub-task starts. Only option I see right now is to rewrite the whole drawTasks() method of GanttRenderer.

A nice to have would be to show the overlapped section in a different color.

Answer 1

Nevermind, I found the fix. Turnsout, the subtasks was already overlapped. Decreasing the color saturation by overriding getItemPaint() did the Job.