How to change show progress dialog

MIT App Inventor Help
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1

Please I tried to change background´s and text´s color of my SHOW PROGRESS DIALOG

NOTIFIER_PROPERTIES
NOTIFIER_PROPERTIES595×502 50.5 KB
but it seems it does not work i do not if it is because APP inventor has change to a new version of app.

2

See Notifier Show progress dialog properties
You cannot change the stock progress dialog color/background.