Line chart with shaded area?

I would like to make a chart like this:

Where there is a shaded goal area, and then a line.

The goal area is NOT hard coded, it needs to be set be mapped against a measure.  In the above example the goal line happend to be static, but it could change over time.

Any suggestions?  Thanks!

EDIT:

This is the closest I could come, but I would really like to be able to format the shading to drop that from the second measure:

That redish pink area would work better as a LINE not a shaded area.