Drop-Down List

You could create a drop-down list by specifying the select mold and single row. Notice you cannot use multi-column for the drop-down list.

<listbox mold="select" rows="1">
    <listitem label="Car"/>    
    <listitem label="Taxi"/>    
    <listitem label="Bus" selected="true"/>    
    <listitem label="Train"/>    
</listbox>