This documentation is archived and is not being maintained.


Call this member function to modify a window's extended style.

BOOL ModifyStyleEx(
   DWORD dwRemove,
   DWORD dwAdd,
   UINT nFlags = 0 


Specifies extended styles to be removed during style modification.


Specifies extended styles to be added during style modification.


Flags to be passed to SetWindowPos, or zero if SetWindowPos should not be called. The default is zero. See the Remarks section for a list of preset flags.

Nonzero if style was successfully modified; otherwise, 0.

Styles to be added or removed can be combined by using the bitwise OR (|) operator. See the topics Extended Window Styles in this book and CreateWindowEx in the Windows SDK for information about the available extended styles

If nFlags is nonzero, ModifyStyleEx calls the Windows API function SetWindowPos and redraws the window by combining nFlags with the following four preset flags:

  • SWP_NOSIZE   Retains the current size.

  • SWP_NOMOVE   Retains the current position.

  • SWP_NOZORDER   Retains the current Z order.

  • SWP_NOACTIVATE   Does not activate the window.

To modify windows using regular window styles, see ModifyStyle.

// This example would make the dialog box transparent by
// changing the dialog window's extended styles.
int CAboutDlg::OnCreate(LPCREATESTRUCT lpCreateStruct)
   if (CDialog::OnCreate(lpCreateStruct) == -1)
      return -1;

   ModifyStyleEx(0, WS_EX_TRANSPARENT);   

   return 0;

Header: afxwin.h