Merge regions, successful, but original pre-merged smaller regions remain?

Question

Merge regions, successful, but original pre-merged smaller regions remain?
I can't seem to figure this out....
I take one long continuous region, chop it up into smaller regions using the scissors tool, move some notes around etc, add crossfades, all sounds good, so then I select all these regions and hit the merge button. All the region appear to merge, creating a new continuous file / region. Excellent.
But yet if I click in the gray area of the arrange window, the new merged file disappears from view and I still see all my multiple pre-merged regions with crossfades sitting there. If I then try to select them, the new merged file suddenly appears instead.
It would seem that both the new merged region and also the old multiple smaller regions with crossfades are all still sitting there in the same place at the same time. But I wish to only have the new merged continuous region exist, I no longer want all the chopped pieces there any longer.
Last time this happened I was somehow able to just select the individual small regions from the area and delete them one at a time until they were all gone, then I had only my new merged region and I was happy. But this is surely not the correct way to deal with this. As well, this method is very laborious and tedious when working with 11 drums tracks and maybe 30 chops etc... we're talking over 300 small regions to be deleted manually Again, I cannot select them all at once because when I try, the new merged region (that I wish to keep) appears and I cannot get to the smaller regions I wish to delete.
I was thinking of going into the media bin and choosing "select unused regions" and then trying to delete, but I have other unused regions in the project that I do not want to delete yet.
Some important notes... when i've been doing this merging, I am in Logic 9, and I'm merging 11 grouped tracks at once using the "merge per track" function. Also, it appears that the first track of the group merges ok and I do NOT see the old multiple smaller regions there anymore, this track seems to merge "properly"... but the other 10 grouped tracks do not, they DO merge, but the old multiple regions are still there and causing me big headaches.
I must be overlooking something here, can't seem to figure it out, any help appreciated.

Answer 1

Thanks.
I will mention that as a work around I tried ungrouping the tracks and then just merging one track at a time using the regular "merge" process (and not "merge by track")... this seemed to work ok, I was able to merge the regions properly and do not see any traces of the old regions behind.
So there's something up with the "merge per track" function, it merges the first track of grouped tracks properly, but then on the remaining tracks, it DOES merge each one and creates new regions per track, but it DOES NOT make the old regions go away.... and once they're there, it's extremely hard to get rid of them.... and they cause a lot of trouble.
Perhaps I am either misunderstanding or misusing the "merger per track" function? Any thoughts? It would be nice to use it so that when i have say 18 grouped drum tracks I can just hit "merge per track" and then walk away and get some coffee or whatever as opposed to having to sit there and press the merge button 18 times... not the end of the world, but... would be neat to know what's going on here.
Cheers!