This topic is included for completeness. For more detail see the source code located in the VC\atlmfc\src\mfc folder of your Visual Studio installation.
virtual void OnDrawRibbonCategoryScroll(
CDC* pDC,
CRibbonCategoryScroll* pScroll
);
Parameters
[in] pDC
[in] pScroll
Requirements
Header: afxvisualmanager.h