Prevent the self-selection of list box data.

I have a combo box that loads the data from a field in collection ArrayCollection which is populated by some time after the end of the loading of the application.  Is there a property I can set for the drop-down list box don't select anything once that the data meet the ArrayCollection collection?  I just always to choose a white so that the user is obliged to select something from the list after loading in...

Info on the guest, in the case where it is not

http://livedocs.Adobe.com/Flex/3/langref/MX/controls/ComboBox.html#prompt

http://blog.flexexamples.com/2008/06/01/setting-a-prompt-on-a-ComboBox-control-in-Flex/

Tags: Flex

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