Check box within repeat control

I have a check box control within a repeat

How do I get a handle on the value of the check box when it is checked? I can get a handle on the ID of the checkbox (the complete ID) but cannot get the value - when I try to use the value property, all I get is “on” even though I have set the checkedValue and uncheckedValue properties in the IDE. I’m confused as to what these two properties do if they don;t let me get a handle on the value when the check box is checked

TIA

Mike