In this example you can only download objects of a set type. You could populate the drop-down with a list of different types using a custom database query in the Grouped Options property. This query would fetch all object types with names starting "EXAMPLE":
SELECT Label as DataValue, Label as DataDisplay FROM Types WHERE (CSPublic = 1) AND (Label LIKE 'EXAMPLE%') ORDER BY Label ASC
The object's label is used for the display and value properties of the drop-down list. CSPublic = 1 limits the query to public object types.