Sorry for the delay in response. I had fixed this issue and it was to do with
my model. The Multiselect was not properly bound to a model. Infact I
started using Palette control which is very good. 

And as for hiding and unhiding I found that sometimes just using
setOutputMarkupId does not work all the time but using the above as you
suggested the setOutputMarkupPlaceholderTag(boolean) works.

Might post a thread on why and what the difference is between them.


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