Hallo Andreas,
here another suggestion...
there is an option to "Run a script on First Load", which updates the button text, when a string is returned... works fine.
In case the script does not return a value (because it is used for something else),
the button text is changed to this
Maybe you can add an "Action Excecuted on Load" in here as well ?
(or avoid changing the button text if no return string is available....)
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Thx,
Christian