WMS Legend

I'm attempting to incorporate services from http://nowcoast.noaa.gov. I've been able to work through my issues getting them to display. My question now is that I am able to view the graphics/polygons with no issue, but there's really no explanation as to what each means without having to do some research. is there a way to incorporate a legend that populates on the screen when the layers are activated? I've seen a few previous posts referencing use of the STATIC IMAGE widget, but in my experience, that image is always on the screen and not capable of being deactivaed.

Does anyone have any possible solutions for this? This seems like it should be relatively simple to fix, but I cannot find a solution.


Thanks