The only way I know of is to convert the regions to WAV files using the Local Audio menu > convert regions to new audio files, or something like that (can't remember the exact name). Then you can glue them. I seem to remember that leaving them as AIFFs just converts them back to an apple loop you still can't merge ... maybe thats fixed now. Anyway, give that a shot.
It would make sense that Logic should just create a new region frm the noncontiguous files ... but it does not, for whatever reason. Tere's lots of stuff you should be able to do with apple loops, but can't (cough ... create fades).
Yeah, converting them to aiff just convert them back to appleloops, so it does'nt work. If I remember well, converting them to WAV will revert the appleloop to it's original tempo, so it will only work if the song tempo is the same as the original appleloops tempo.
The only way that I know of is to bounce the section of the track you want to merge to a new audio file and import it back to the arrangment. Don't forget to solo the track and to click the "add to audio window" before bouncing. Then go to the audio window, and drag the new audio file to your arrange window.