It should work when you add the corresponding meta data to your meta data file of your custom widget - here is a screenshot of the code from the iq-responsive-menu that shows the name and structure:
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@HmiGuide That's why we always recommend to use responsive layouts in the first place - changing it later often means starting from scratch - especially when everything has been positioned absolutely.
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Have a closer look to the PLC example. I added the FB IL_String, which has 2 important features:
String length is not limitted to 255 as standard CONCAT function
Is very performant at creation of long strings.
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