Called by the framework when the user resizes the frame.
afx_msg void OnSizing(
   UINT fwSide,
   LPRECT pRect
);
Parameters
- [in] fwSide 
 The edge of the frame that is moved. See the parameter wParam in WM_SIZING Notification.
- [in, out] pRect 
 Pointer to a CRect Class or RECT Structure structure that contains the frame's coordinates.
Requirements
Header: afxframewndex.h