need help to modify an existing routine for Acad 2006 Fields

[vbcad]

below is some code for a routine that i am trying to modify. it is curently used to zoom all layouts in some drawings. what i would like it to do is got thru the paperspace layouts and update all fields that it encounters. i believe to access the fields it is iacadmtext2 but that is VBA language. how do i get there thru VLA? See the red text below. IS this the line i need to modify?

(defun update_all_fields	(/ lay layouts *acad* *doc* )
	(vl-load-com)
	(setq	*acad*	(vlax-get-acad-object)
	*doc*	(vla-get-activedocument *acad*)
	layouts	(vla-get-layouts *doc*)
  	)
	(vlax-for lay	layouts ; step through layouts 
	(vla-put-activelayout *doc* lay) ; activate layout 
	(if	(= (vla-get-activespace *doc*) 0) ; If in paperspace 
	(if (= (vla-get-mspace *doc*) :vlax-true); in mspace viewport 
	(vla-put-mspace *doc* :vlax-false) ; inactivate vp 
	) ; endif 
	) ;endif
	[COLOR=red](vla-ZoomAll *acad*)[/color]
	;(vla-zoomextents *acad*)
	)
	)
	(defun c:zal ()
	(update_all_fields)
	(COMMAND "PDMODE" "1")
	)