I just tried it and it works perfectly. Thank you to the three of you who offered your assistance.

You can also pre-set values in the dialog if you want. You can do this by calling CheckDlgButton() inside the WM_INITDIALOG message.
ex (from the previous example):
case WM_INITDIALOG:
{
CheckDlgButton(hwndDlg, IDC_RADIO2, true);
}

You could use this to possibly store the last settings that the person used, and then automatically default to those settings when starting the program again. For edit boxes, you could use the functions SetDlgItemInt(), and SetDlgItemText() to set default values.

jw

thanks jwace81!

Thanx jwace81, this is the next thing I was going to have a look into.