HP48G soft menu toggle: How?

[DM48]

A tangent to my above. I am trying to write a simple program that will test of FLAG 20 is set, if yes then put the FLAG on the softmenu, if not, don't put the flag on the soft menu.

It seems to work at startup without issue. What is a good way to arrange the code so it would refresh upon a change while running? I am unsure how to handle this.

I hope this makes sense. My program below. I just typed the code from my calculator so it may not be formatted exactly but I think you will understand it.

Program stored as:

'XX'

Code:

 \<< "T->D"

IF 20 FS? 1 = 
THEN # 3A328h
SYSEVAL

ELSE # 3A38Ah
SYSEVAL
END

\<< 2  *  \>> 2 ->LIST {}
{"SF 20" \<< 20 SF \>> } 
{ "CF 20" \<< 20 CF \>> } 
{ "XX" \<< CLLCD \>> }

{"CANCEL" <<\ 2 MENU \>> } 

6 ->LIST TMENU  \>>