WM_NCLBUTTONUP required from the window frame does not fire. What is the easiest Delphi fix please?

I need an event to fire when the use stops changing the开发者_运维知识库 size of a window, i.e by releasing the mouse on the frame. I've tried WM_NCLBUTTONUP but this does not fire - I presume because there are lots of complaints about it not working. Has anyone got an example of how I can work around this please? I simply need to know when a resize has ended. Thanks

Listen for WM_EXITSIZEMOVE.