Also, related, google for the term "windows owner-drawn controls". I just did, and here are a couple of relevant links:

https://msdn.microsoft.com/en-us/library/windows/desktop/bb7...

(above page's subtitle: "Creating Owner-Drawn Controls")

Using Visual Styles with Custom and Owner-Drawn Controls:

https://msdn.microsoft.com/en-us/library/windows/desktop/dd3...