String[] ops = presenter.getOperatorCompletions( availablePatternsSelection,
chosenConditionsSelection );
CEPOperatorsDropdown ddOperator = new CEPOperatorsDropdown( ops,
chosenConditionsSelection );
ddOperator.addValueChangeHandler( new ValueChangeHandler<OperatorSelection>() {
public void onValueChange(ValueChangeEvent<OperatorSelection> event) {
chosenConditionsSelection.setOperator( event.getValue().getValue() );
presenter.stateChanged();
validateConditionOperator();