Nice. I'm also creating UI with actors and I use events to activate them. For now, I have just a scrollbar and other things that I don't know the name
Planning to put on the forge one day ... when I'll have the whole kit.
do you use text fields ( i mean the class textFields, or did you make your own) for the cell fields ? I noticed you have capital letters. if you type shift+letter , does the capital letter work ?
Sorry for all the questions, but I'll have a big part UI to do on my project so I'm pretty interested 
As an exercise, I try to create the entire thing using only the blocks available to Stencyl. I did have to use a couple of 'code' blocks for things like indexes in nested loops (Stencyl got them confused at one point and I decided to simply 'code' them all), nulls, and empty string value. I also have to bite the bullet and use pure code to enumerate available fonts. Aside from that, though, it's all Stencyl blocks.
For the cell fields, I use Stencyl's 'Any Key' event. It works well enough with shifted letters, I simply passed the characters 'as is'. For now the only other keys it handles are Backspace and Enter, but I'm planning to expand it further to accept navigation keys, mid-string edit, etc. But that's in the future, along with *gasp* Menu bars.

For now, I am concentrating on finishing up the data manipulation and saving part, make it look decent, etc.
I can share my current actor, if you like. The codes are kinda messy with many things need to be organized, optimized, and debugged. I have all sorts of experimental codes and have not yet implement full error handling and attribute fall backs. But if you want to take a look....