How can I create a button in OpenCV C++?

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I need the code to create a button in OpenCV C++. I have to create a menu and I need a button to select between different options. I don't have idea about how create the class for the button.If someone can help me, I would appreciate it so much, this is for my final project. The only programming languages I know are C/C++, I´m using the compiler CodeBlocks