asterisk users - Oct 2004 - Specify location of ADSI Softkeys ?

Does anyone out there know the syntax to specify where the softkeys show
up on an ADSI phone ??  On the Aastra 390 and 480 phones there are six
locations for softkeys.  I can get all six softkeys defined by doing
SHOWKEYS "blah-0"
SHOWKEYS "blah-1"
SHOWKEYS "blah-2"
SHOWKEYS "blah-3"
SHOWKEYS "blah-4"
SHOWKEYS "blah-5"

but the softkeys just show up on the phone in the order listed ....
Blah-0            Blah-3
Blah-1            Blah-4
Blah-2            Blah-5

I want to be able to skip locations but I can't figure out how to
specify the exact location of a key so they would show up like this
where some locations are blank.
Blah-0           Blah-3

Blah-2           Blah-5

I know it's possible because app_voicemail.c does this but I don't
understand it at all :(

--
Lance

I've come up with a temporary solution to locate the softkeys where I
want them...

set up the following key:
KEY "blank" IS "" OR "Blank"
	GOTO "offhook"
ENDKEY

then you can do....
                SHOWKEYS "park"
                SHOWKEYS "blank"
                SHOWKEYS "xfer" 
                SHOWKEYS "hold" 
                SHOWKEYS "blank" 
                SHOWKEYS "flash"

and end up with softkeys laid out like this:
-PARK           HOLD-

-X-FER         FLASH-

If anyone has a better solution, please let me know.