void CheckRadioButton( int nIDFirstButton, int nIDLastButton, int nIDCheckButton );
nIDFirstButton
Specifies the integer identifier of the first radio button in the group.
nIDLastButton
Specifies the integer identifier of the last radio button in the group.
nIDCheckButton
Specifies the integer identifier of the radio button to be checked.
Checks the radio button specified by nIDCheckButton and removes the check mark from all other radio buttons in the group of buttons specified by nIDFirstButton and nIDLastButton. Checking a radio button turns the radio button on or off.
CWnd::GetCheckedRadioButton, ::CheckRadioButton