{attribute 'conditionalshow' := '...'}

2020-02-27T13:49:04.058000Z

I have seen this in a library template, provided by CoDeSys:

{attribute 'conditionalshow' := '3SLib_Developer'}

Can please someone tell me, how does this work?
I need some similar functionality, to hide diagnostics information, but optionally show it in the application...

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{attribute 'conditionalshow' := '...'}