Until the release of Fruity Loops 12, which promises a native Mac OS version, there isn't a way to get Ableton and FL11 to play nicely together- until now! This requires that you install Soundflower, so use the link below. This is a handy way to get some of the cool sounds out of FL11 and into Ableton until a proper ReWire is written or until FL12's native OS version is released.
As you'll notice in the video, however, it's not a perfect method. There is the occasional stuck note in FL, but all you need to do is to click the note on the keyboard of the synth last used (found that out after stopping the screen capture).