On 9/24/22 23:19, roger tunnicliffe wrote:

" That's because no tabs were defined in your Fl_Tabs widget,
    making it effectively 'invisible'."

I did actually have them coded but just did not show that in the code I pasted as I had tried to supply only the relevant information. (obviously that was relevant (lol))

    Heh -- yes, it's hard to know what's relevant and what isn't when starting out.

    It's best to try to reduce problems to complete but simple working programs.
    There's a simple example of using tabs on my FLTK cheat page.