How can I fill a message box with an empty option whit UIX?

Hi dear forum:
I created a message box in UIX and I filled it with data from a table, but I need that the first option be in blank; I need an empty option.
thanks dear forum

If you are using a ADF/BC4J view object to get the data, you can modify the sql query statement to add a null option UNION'ed with the original query. Example:
SELECT NULL DEPARTMENT_ID,
NULL DEPARTMENT_NAME,
NULL MANAGER_ID,
NULL LOCATION_ID
FROM DUAL
UNION ALL
SELECT Departments.DEPARTMENT_ID,
Departments.DEPARTMENT_NAME,
Departments.MANAGER_ID,
Departments.LOCATION_ID
FROM DEPARTMENTS Departments
I also saw this tip somewhere but I don't know how (or if) it would work with uix:
http://www.oracle.com/technology/products/jdev/tips/mills/null_list_entry.html

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How can I fill a message box with an empty option whit UIX?

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