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)