String factType = cc.getFactType();
String fieldName = cc.getFieldName();
String[] operators = this.getCompletions().getConnectiveOperatorCompletions( factType,
fieldName );
CEPOperatorsDropdown w = new CEPOperatorsDropdown( operators,
cc );
w.addValueChangeHandler( new ValueChangeHandler<OperatorSelection>() {
public void onValueChange(ValueChangeEvent<OperatorSelection> event) {
OperatorSelection selection = event.getValue();
String selected = selection.getValue();
cc.setOperator( selected );