How to force configured Tic marks on scale to show/update per default after widget creation?

I can not figure out what to do to show tic marks I added to a scale as shown below.
They do only show/draw after I move/change the scale bar once.
Changing the value does not help.

Hi,

Which gtk version?
How do you build the scale marks?

I never saw this issue, it would be great if you could provide a minimal reproducer example.

Sorry, I resolved the issue. It seam using signal_handler_block() is also preventing drawing updates. That I did not expected, only needed to block “value changed” signals.

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