This article s main purpose is to show another aspect of BEGIN_MESSAGE_MAP(). In MFC, whenever there is a need to make a button control dynamic, we often get hung up on the point of defining a method for that button such that when that button is clicked, our method will be called. This article is going to show you a sample of code where I have created a dynamic button. This button is mapped with a function as per the job selected by the radio buttons.