remember Apple deprecated those API 11 years ago, giving all developers plenty of time to remove all code dependency, before they obviously just now “killed” them outright.
Indeed they did, but not even Apple has removed the usage of the old API… Finder still uses it at the moment. ha ha…
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the epitome of
do as we say not as we do ?
kind of like Xojo telling us to use API2 yet the IDE isnt fully API 2
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I had the same in my Find Any File when I try to support back to macOS 10.11
IIRC, it only happened with SegmentedControls. They are tricky for toolbars. Oh, the Search tollbar item also needs special handling in older vs recent (10.15 i think) versions.I was not able to resolve this with a prepared nib (Xcode) but had to construct the Toolbar in Code in the end, with different code paths for the old vs the new search control (the new one can collapse into a ? Icon)
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I won’t tell Xojo users that the macOS has a search item for the toolbar of you don’t 
lol…