A simple window menu? That's all written down in the manual including a perfect example. Really, the B+ manual is quite good, first toy a bit with the manual and its small examples, then after a week try some new code of your own.
Unless of course you were referring to non-GUI menus. That's something you'll have to code yourself then..
Unless of course you were referring to non-GUI menus. That's something you'll have to code yourself then..