Subsequent ajaxy disable/enable selector actions require page reload

1. Go to a selector with ajaxy disable/enable actions (Participant Status for example).
2. Disable (or enable) a row.
3. Try to re-enable (or re-disable) the same row (without reloading the page).

Effect: The second action is treated the same as the first one - both the confirmation text and the outcome are wrong (i.e., the same as with the first action).

Reloading the page between the actions mkes the second action work properly.

Observed on trunk on r23050.