JFreechart Gantt chart combined Time series Chart

Question

I'm working on developing a tool that will have two JFreechart Chart panels -

1. A Gantt chart at the top
2. A Time series chart at the bottom

Now, my requirement is :

• Both these charts should align and have same x-axis
• When I zoom in on the Gantt chart, it has to zoom in the time series chart too.

I've done some study on this already, but could not find a way out - Here is what I tried:

• XYTaskDataset cannot be used on Gantt chart
• Could not create overlay charts either as the Gantt chart's data set is "GanttCategoryDataset" and the timeseries is "XYDataset".

What is the best way to achieve this?