How Can I Create a ROOT TLegend Fill Box?

[ChrisVer]

Does someone know how I can make such a legend entry in ROOT?

I have tried all the draw options ("L","F","E") but I am unable to get this result.
It really looks like a mixture of LF, but LF draws me a rectangular box enclosed in black line.

extra info: I am using two graphs, one is for the error band and the other is for the line inbetween.

 

[DrSteve]

The ROOT Forum is the place to get answers to ROOT questions like this one.