[MSDN Library April 2000] WM_CTLCOLORBTN (100%)

MSDN Library - April 2000 > Platform SDK > User Interface Services > Windows User Interface > Controls > Buttons > Button Reference > Button Messages

[MSDN Library September 1992] WM_CTLCOLORBTN (54.9003189792663%)

Product Documentation > Win32 SDK for Windows NT > Programmer's Reference: API (prelim. ) > API Function Reference > Messages

[MSDN Library April 2000] WM_CTLCOLORBTN (48.0689102564103%)

MSDN Library - April 2000 > Windows CE Documentation > Application Development > API Reference > User Interface > Messages