How to add first blank entry in messageChoice

I have a messageChoice that's populated entirely from the associated model (which happens to be a backing view/sql table). The only items that show in the list are populated records from my view/table. This is sufficient for create / edit forms, where I must have a value for the field that this messageChoice binds to. But it is problematic on the UIX Search Form component, because I need a blank entry in my messageChoice, so if the user creates new search criteria, it doesn't automatically take the first value in the list as part of the filter.
How can I add a blank first option in my messageChoice when the messageChoice is bound to a model backed by a view?
Thanks.
Brad

http://www.oracle.com/technology/products/jdev/tips/mills/null_list_entry.html

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