Hi,
when I tried to wrap a SelectElement with a ChosenListBox there occured a NullPointerException in ChosenImplFactory (line 26).
The reason for this behaviour is that the ChosenOptions are not set when the ChosenListBox is created via ChosenListBox.wrap().
I would recommend to set the ChosenOptions initially with
"private ChosenOptions options = new ChosenOptions();"
in ChosenListBox (line 64).