Remove other options on change

This is just a little issue, but it would be great if all the options in child containers were removed while the new data was loading. I've found that on my testing server it can take a while for the new data to load, and it's hard to tell when it does.

If there was a function like clearAll() that would set the length of the options below the changed element it to 0 and that function was called onChange as well as the existing on, it could help the UI a lot.

Just a thought.

I will try to play with this myself, but this is more of an idea than anyhting else.