As a GH user I would like to click on a piece of chart line to get the details about what happened with the involved issues.

When the estimation accuracy chart changes in a burn down it would be great if you could click on that part of the chart to get detailed issue information about what has changed.
Say a user has logged more work than was originally estimated for some issues. It would be great to be able to step to these issues by just clicking on parts of the burn down chart.