You need to use v10.0.6 or later to save a compound clip in an event from the project. You need to reattach the hidden compound clip to the clip before it, just shift it to the left, and then delete the gap clip that was created when you lifted the compound out of the timeline.
PS you need to either update your tech information or update your OS. 10.8.1 is not a tested and supported version of the OS.
I think I got it, lift the compound clip from storyline by right clicking and choosing "lift from storyline",
drag the compound clip left or right out of its original position, select the grey slate where it used to be in the time line, and hit delete. the clips to the right now shift left to fill its void.
and the compound clip is automatically available in the event library folder its grouped clips originated from but now shown as a compound clip once you create that compound clip..