Triggers in dropdown

Hi Everyone, 

I am trying to add expressions in my lemon puppet in CA. My workflow is:

1. Import puppet
2. Import .wave file for audio
3. Compute lipsync
4. Compute head movment
5. Then add expressions during a record (and subsequent records).  
6. Edit expressions in timeline 

I like to use icons in the control/perform panel, during record and then edit those in the timeline with the dropdown menu.  See attached screenshots.  I admit I might not even be using the right terms for this kind of thing so the right terms would help.  I'm having someone make me new expressions but they don't show up in that dropdown that activates when I click on an expression in the timeline so I can't change to the new available expressions.  I might need to connect these myself since there is a communications gap so any help would be much appreciated.   Links to tutorials, the right terms to use to help me communicate to the person making these expressions/behaviors/whatever they're called?  Thanks so much!