How to make a Win32 dialog appear at the default position (CW_USEDEFAULT)?

Question

How do I make a Win32 dialog appear at the default position/size?

(i.e. How do I simulate CW_USEDEFAULT for CreateWindow when the window is already created)?

Answer 1

Create a temporary invisible window with CW_USEDEFAULT and see where it gets positioned. Move your dialog there.