Thanks
It helped me. But just another problem.
I have a customized multiple choice with 2 multiple ListMultipleChoice
inside. and movieng selected choices from each other. 
I have problems with safe cast.

Here is my class definition:
public class CusomizedMultipleChoice<T> extends Panel

Here are the two method I used.

Collection<T> leftChoices = leftChoice.getChoices();
Collection<T> selectedLeftChoices = leftChoice.getModelObject();

The compiler complains at first method. getChoices. Shouldn't return return
a collection of T.  compiler ask me to cast at Collection<T>. Is it safe to
do this?
I checked the wicket sources but couldn't find the cause.
Is anything wrong?
Thanks. 



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