how to get the next item value based on the selected item in userform listbox ?

I have a simple userform :

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Say, the listbox show items :
AAA
BBB
CCC

If the user click BBB, I need to get the next item value which is CCC.

So far I've tried :

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Now, if I click BBB in the listbox, the MsgBox i shows 1 and the MsgBox i + 1 shows 2.

How do I make the code to have a MsgBox shows "CCC" ?

Any kind of respond would be greatly appreciated.
Thank you in advanced.

Thank you very much davesexcel.