Unfortunately, the Rally application does not have an 'out of the box' solution to meet your needs. I did not locate a post that seems to fit this same requirement on Rally Ideas, and I recommend posting this suggestion to allow other Rally users to add their comments and votes to help in promoting it. This also gives our product owners the greatest insight into the number of customers interested in a particular enhancement and is used to help prioritize feature work on our backlog.
You may be able to create a customized burndown chart using custom code. Here is a link to our Developer Portal (
https://help.rallydev.com/for-developers) to help you get started. I would also recommend visiting Stackoverflow – it is a site where you may get some assistance with this. The following link will take you to the area where developers who use Rally are active:
http://stackoverflow.com/questions/tagged/rally