Correct me if Im wrong, but the flush attribute on combo filed will trigger ONLY IF the user types in a new value, but when selecting a value from the value help. It wont... seems like it doesn't know that the value is changed via selecting an item on the value help.
Kindly check.. also tried tabonenteralwaysflush attibute but it didnt work.
the COMBOFIELD sends FLUSH-events only if the value was changed on client side. In case of value selection by the server it does not flush because it is actually your server side logic that set the value...