Automatic account creation is now enabled. Captcha authentication required for account creation and editing unless you are trusted here.

From WiX Wiki at MindCapers

The ListItem element turns into rows in the ListBox table in the MSI package. (The ListBox element just wraps the ListItems with a property name.) You can't use ListBox to dynamically add/remove items other than via a custom action that adds temporary rows. You can, however, use formatted strings for the value and text.

    <ListBox Property="ListBoxProperty">
        <ListItem Value="1" />
        <ListItem Value="2" Text="some localizable text" />
        <ListItem Value="3" Text="some localizable text" /> 
    </ListBox>