change fld selection on tab

[yves COPPE]

Hello,

I've a stack used as DLOG (Modal stack)
It contains a few flds.
I'd like the user can jump from one fld to the following when 
pressing the Tab key on the keyboard.

I've found a possibility to check : change fld on return key
but it's not the convention on mac.
I'd also like the tab key returns to the first fld when the user is 
in the last fld.
If there is something written in a fld, pressing the tab key should 
enter the fld and select the text already there.
Can someone help me for that ?

thanks.
-- 
Greetings.

Yves COPPE

Email : yvescoppe at skynet.be