callback for a button

I have made a calendar that looks similar to Outlook, and I have the next/previous buttons, but they don't do anything when you click them. Could you help me figure out how to create the callback so that when I click next it goes to the next month?
Thank you
This will depend on the GUI toolkit being used. It's not C++ specific.
It is C++/FLTK
Then you need to consult the FLTK documentation/tutorials :) It's been like 10 years since I did FLTK so I don't know from memory unfortunately.
Okay, thank you!
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