Overwriting the ComboBox/VFilterSelect onClick Method

Hi there,

i create a new Component - VSuggestComboBox on the Clientside by extending VFilterSelect. 

public class VSuggestComboBox extends VFilterSelect {

    protected List<KeyCodeListener> listeners = new LinkedList<KeyCodeListener>();
    
    @Override
    public void onKeyDown(KeyDownEvent event){
        if(!enabled || readonly){
            return;
        }
        
        int kc = event.getNativeKeyCode();
        if(kc == KeyCodes.KEY_ENTER){
            if (event.getSource() instanceof TextBox && !"".equals(((TextBox) event.getSource()).getText())) {
                fireEnterEvent();
                return;
            }
        }
        super.onKeyDown(event);
    }
    
    @Override
    public void onClick(ClickEvent event){
        fireSearchEvent();
    }
    
    private void fireSearchEvent() {
        for (KeyCodeListener l : listeners) {
            l.search();
        }
    }
        
    private void fireEnterEvent() {
        for (KeyCodeListener l : listeners) {
            l.onEnter();
        }
    }

    public void addListener(KeyCodeListener l) {
        listeners.add(l);
    }

    public void removeListener(KeyCodeListener l) {
        listeners.remove(l);
    }
    
    public interface KeyCodeListener {
        public void onEnter();
        public void search();
    }

Catching the event when the user presses Enter works perfectly, but i exchanged the "drop-down-buttons" icon with a search icon and want to catch the onClick event. As you can see in the class i overwrite the onClick(ClickEvent event) method from VFilterSelect, but the event is never fired.
The intention is to use this button as the search button and have the combobox suggest hits, everything works fine but the onClick-Method seems to never be called.

Am i overlooking something or doing something wrong? Im aware of the fact that in VFilterSelect the event is analyzed for the source of the click, and by just overwriting the method without calling super.onClick i should get every click-event on the box, but i get nothing...

Any help is highly appreciated!