Setting default value for LISTBOX

Using WIN32, MS c++ prof SP 5.

When the dialog box is displayed I want it to show the first value that I have set (total of 15 values). The first value will be used the majority of the time so I dont want to bother the user to have to select it.

I created the Dialog box in the resource editor

MY DIALOG PROCEDURE:

BOOL CALLBACK CheckinDlgProc (HWND hDlg, UINT message,
WPARAM wParam, LPARAM lParam)

MY CONTROL ID

IDC_persons

Thanks for the Help.......