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DuelingListBoxesElements Undefined

I have been trying to get the "Many-to-Many relationship using multiselect picklist example" (http://wiki.apexdevnet.com/index.php/Create_a_many_to_many_relationship_with_a_multi-select_picklist) to work. However, I get a javascript error "DuelingListBoxesElement is undefined" error when I try to move the selection from one list box to another. This error seems to be stemming from the javascript function used i.e. moveOptions(<param list> )
Am I missing a library reference? Appreciate your help in advance.

Message Edited by trish on 07-23-2008 10:26 AM

Message Edited by trish on 07-23-2008 10:26 AM
A quick search of these boards for that exact error gives you:


Where I specify the solution -- you just need to include a JavaScript file.