Writing variable value to a textfield during(not at the end of script) script.

Hi,

May be this is a stupid question, but I need to know the answer.

The question is

Is it possible to write a variable's value to a text field or numeric field during or in the middle of a script, not like at the end of script. Actually I found that live cycle designer forms writes values to fields when event script finishes.

I tried on a click even of a button.

TextField1.rawvalue  = "5" ;

xfa.host.messageBox("test message");

But code shows alert message first and then writes the value afterwards. When alert windows pops up text field is having old value or say blank.

Thanks

Arvind