dimension fill color property?

Hi all,
I'm trying to make a routine to one click a dimension to "mask" the text.
(ac2005)

I can do it through the properties box under Text|FillColor| set to
"Background"

after dumping an object I find the TrueColor Property has changed but the
actual value seems random

How to set the TrueColorProperty to "Background"? may be the specific
question.

Thanks for any help.
Mark


(setq before(vlax-get-property dimobj 'truecolor))
;before mask
; TrueColor = #<VLA-OBJECT IAcadAcCmColor 0c813bd0>
; and another time
; TrueColor = #<VLA-OBJECT IAcadAcCmColor 47133bc0>

;after mask
; TrueColor = #<VLA-OBJECT IAcadAcCmColor 0c8096b0>
; and another time
; TrueColor = #<VLA-OBJECT IAcadAcCmColor 0f02fc40>

also tried
;; call the color object
(setq colorObj (vla-getinterfaceobject
(vlax-get-acad-object)
"AutoCAD.AcCmColor.16"))

(vlax-invoke-method colorObj 'item "Background") - no item property

(vlax-invoke-method colorObj 'name "Background") - no name property

 

OOPS!
forgive the lisp code...forgot which group I was looking at...
but the question is the same, vb or lisp reply equally appreciated...