(TIP) Check the radio button control / MFC or API

[mfc case]
((CButton*)GetDlgItem(IDC_RADIO))->SetCheck(true);

[api case]
HWND hWnd;
hWnd = ::GetDlgItem(GetSafeHwnd(), IDC_RADIO_NOTIFY_ALL);
::CheckRadioButton(hWnd, IDC_RADIO_NOTIFY_ALL, IDC_RADIO_NOTIFY_CONTENTS, IDC_RADIO_NOTIFY_ALL);
::SendMessage(hWnd, BM_SETCHECK, (WPARAM)BST_CHECKED, NULL);