Copied option control changes properties (1 Viewer)

I want to add a option button to an option group and googled for instructions. Was told to copy/paste an option control within the group.

But this doesn't seem right. In properties for the new control (under "All") the second item should be (were it the same as the rest) 'Option Value', but it is 'Control Source'. There's other differences too, compared to the one it was pasted from. Isn't that a bit odd? Shouldn't a copy be identical.

Also the new one has a dot (selected ?) whereas the rest are grayed out.

How is this so different to the rest and can I make it the same ?

You place a frame on the form.
Then place option btns IN the frame.
Each option btn gets a value.
When the user picks an option, the value is assigned to the frame.
The frame is bound to the field.

See if you can make sense of the following picture. It shows the original option group and then how you expand the control and finally copy the last item, rename it, and change it's option value to the next available number.

Thanks... I have it working now. It had somehow not grouped itself the first time.