EXS 24 Logic Sampler Users Group

Following situation:
Let's say You create a simple song like this in Logic (my current version is 6.4) :

1st Track: EXS Instrument :Guitar - 4 bars
2nd Track: EXS Instrument: Piano - 4 bars

Iet's say you really like this and decide to copy it into a different song. Of course you 
want to keep the particular instruments.

I select those tracks  and copy them into the clipboard. I load the "different " song and 
paste those tracks to a certain position.
Everything is fine with one exception: the EXS instruments are EMPTY. Guitar and Piano 
are gone . 
Of course i tried to select those tracks ,created a folder and copied and pasted it : 
Same Results. 
May be somebody has an idea how to fix this.
Thanks so much to all of you 
Best
Markus