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 RepositionPanes(
CRect& rectNewParentBarArea,
UINT nSide = (UINT)-1,
BOOL bExpand = FALSE,
int nOffset = 0
);
Parameters
[in] rectNewParentBarArea
[in] nSide
[in] bExpand
[in] nOffset
Requirements
Header: afxdockingpanesrow.h