how to change background color

[devitg]

After it 

(vla-put-color mtext-obj 256)
  (vla-put-BackgroundFill mtext-obj actrue)

The backgroundcolor is acred , I don't know how it come so 

back ground color to change

How can I change it to be bylayer or color 42 

[dlanorh]

Look Here => https://forums.autodesk.com/t5/visual-lisp-autolisp-and-general/mtext-background-mask-settings-lisp/...

[dlanorh · Accepted solution]

Also see this for correct settings https://forums.autodesk.com/t5/visual-lisp-autolisp-and-general/mtext-opaque-background-color/m-p/62...

Or use the lisp Here https://adndevblog.typepad.com/autocad/2013/05/change-the-background-mask-property-of-acdbmtext-obje...

The lisp (lower part of page) will need altering so that the correct group code settings match those provided by HM Silva in the first link of this reply.