question: public Bindings addOptComponent ( String property , Class clazz , JToggleButton c , boolean enabledByDefault ) { Binding b = new OptComponentBinding ( this , property , clazz , c , enabledByDefault ) ; if ( _optComponents . containsKey ( property ) ) { throw new BindingException ( Messages . getString ( "Bindings.duplicate.binding" ) ) ; } _optComponents . put ( property , b ) ; return this ; }
target:  Add an optional (nullable) Java Bean component of type clazz.