minimonth not working in an old extension

[opto]

I am trying to revive an old extension which is using the minimonth  <minimonth id="xxx"/>.

It shows month and year in top line, but no day numbers below.
It uses minimonth.css from calendar.
The minimonth is called in a dropdown.

Anybody has an idea what might need to be changed?

many thanks,

Klaus
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[opto]

DomInspector shows that the textfields for day number do exist, but they have no value fields.
If I add a value in DomInspector, tht is displyed.
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[opto]

not sure whether related:

error console: ReferenceError: setBooleanAttribute is not defined in minimonth.xml.

That function is defined in calendar-ui-util.js
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