Checkbox help

I was wondering how to implement Checkboxes in my program using C.

I have created a checkbox in a dialog box, but don't know how to allow it to be checked. When I click it nothing happens. I also want to know how to get/set it's value.

Thanks.
-Nick

This is from one of my projects...

Code:

//This is in the dialog resource file

    LTEXT           "Known variable",CTEXTONE,405,15,70,13
    AUTOCHECKBOX      "Yes",CHECKONE,405,28,45,10

    LTEXT           "Known variable",CTEXTTWO,405,40,70,13
    AUTOCHECKBOX      "Yes",CHECKTWO,405,53,45,10

// AUTOCHECKBOX is different from CHECKBOX
//This is from the DlgProc(), this gets the check state

CHECKSTATEONE = IsDlgButtonChecked(hwnd,CHECKONE);
CHECKSTATETWO = IsDlgButtonChecked(hwnd,CHECKTWO);

To set the check state check here

Thanks scwizzo.