Gantt Chart Series bar

Hi, I'm currently creating a gantt chart using Sap Netweaver developer studio. I'm using the business graphic to create it. But I'm unsure on how to create the series bar on the gantt chart for each category.

I want my gantt chart to be those for projects. Task as the category and the series bar to stretch from the start date to the end date. But I don't noe how to create the series bar.

Thanks in advance =)