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The idea of using a class as mentioned by alunduil is still valid in C. Just think struct rather than class, and remember it's just a container for that dialog. That way you will have a struct for, say a printing dialog box and you can call you cancel button cancel, or btnCancel if you prefer. You can also create a find dialog box again create a struct and the cancel button can be given the same variable name.
That's the price you pay to make the code maintainable.
To help make the code more readable you can always break your lines up and aligning each variable beneath each other, this is often necessary when passing several widgets to a function. You can then choose an alignment style that suits you aesthetic needs.
Not certain what such liberal usage of whitespace Python would make of that approach, probably awaken the Knights who say Ni from within the interpreter.