But it wasn't just one window, there were lots of controls on that window and the relationship between them wasn't as obvious as you'd assume. Trust me, recreating the whole thing from scratch was easier.

The fun part was making a C++ class that could build up an in-memory dialog template. You had to do it that way because it was dynamically sized based on the message you displayed and the buttons you needed. If you used the default colors, you might be able to tell they were different if you squinted but you wouldn't know which was mine and which was Microsoft's.