SuggestField Add-on

Hi, I am using the SuggestField Add-on and I am quit satisfied with it. But now I have a little problem, probably soemone can tell me the reason: If I set a value it is not displayed in the field but it has been set. I think the reason migtht be an error in my code, I hope someone can give me an advice:

[code]
public OrganizationCustomerSuggestionField(Organization organization, OrganizationCustomerType organizationCustomerType) {
this.setLocale(UI.getCurrent().getLocale());
this.setImmediate(true);
this.setInputPrompt(Lang.getString(“playerSearch”, getLocale()));
this.setWidth(100, Unit.PERCENTAGE);
this.setNewItemsAllowed(false);

    //
    // Set the suggestion handler
    //
    this.setSuggestionHandler(new SuggestionHandler() {

        /**
         *
         */
        private static final long serialVersionUID = 5936331305246105024L;

        @Override
        public List<Object> searchItems(String query) {
            organizationCustomers = OrganizationCustomerUtils.searchForName(organization, organizationCustomerType, query);
            
            List<Object> results = new ArrayList<>();
            for(OrganizationCustomer customer : organizationCustomers)
                results.add(customer);

            return results;
        }});
    
    //
    // Create suggestion converter
    //
    this.setSuggestionConverter(new SuggestionConverter() {

        /**
         *
         */
        private static final long serialVersionUID = -8342054010047293L;

        @Override
        public SuggestFieldSuggestion toSuggestion(Object item) {
            // TODO Auto-generated method stub
            SuggestFieldSuggestion sug = new SuggestFieldSuggestion();
            sug.setId(((OrganizationCustomer) item).getUser().getPid()+"");
            sug.setDisplayString(((OrganizationCustomer) item).getUser().getSurname().toUpperCase()+" "+((OrganizationCustomer) item).getUser().getFirstname());

            return sug;
        }

        @Override
        public Object toItem(SuggestFieldSuggestion suggestion) {
            for(OrganizationCustomer customer : organizationCustomers) {
                if((customer.getUser().getPid()+"").equals(suggestion.getId()))
                    return customer;
            }
            return null;
        }});
}

[/code]Thank you,
Florian