AFX_STATIC BOOL AFXAPI _AfxModifyStyle(HWND hWnd, int nStyleOffset,
	DWORD dwRemove, DWORD dwAdd, UINT nFlags)
{
	ASSERT(hWnd != NULL);
	DWORD dwStyle = ::GetWindowLong(hWnd, nStyleOffset);
	DWORD dwNewStyle = (dwStyle & ~dwRemove) | dwAdd;
	if (dwStyle == dwNewStyle)
		return FALSE;

	::SetWindowLong(hWnd, nStyleOffset, dwNewStyle);
	if (nFlags != 0)
	{
		::SetWindowPos(hWnd, NULL, 0, 0, 0, 0,
			SWP_NOSIZE | SWP_NOMOVE | SWP_NOZORDER | SWP_NOACTIVATE | nFlags);
	}
	return TRUE;
}

BOOL PASCAL
CWnd::ModifyStyle(HWND hWnd, DWORD dwRemove, DWORD dwAdd, UINT nFlags)
{
	return _AfxModifyStyle(hWnd, GWL_STYLE, dwRemove, dwAdd, nFlags);
}

BOOL PASCAL
CWnd::ModifyStyleEx(HWND hWnd, DWORD dwRemove, DWORD dwAdd, UINT nFlags)
{
	return _AfxModifyStyle(hWnd, GWL_EXSTYLE, dwRemove, dwAdd, nFlags);
}