vaadin - How to explicitly access the Connector from Widget Side into Vaadin 7?

Question

I create a Widget with his Server Side Class and the Client Side (Connector Class, ServerRPC Class, State Class and Widget Class).

Connector :

@Connect(Custom.class)
public class CustomConnector extends ButtonConnector {

   ...
   public void myFunc() {
      // DO Something
   }
}

Widget :

public class CustomWidget extends VButton {
  ...
  private CustomConnector conn = new CustomConnector();
  public CustomWidget () {
    conn.myFunc();
  }
  ...
}

Now from the Widget Class i want to explicitly call/access the Connector Object, which are not a Singleton, so that i can access a function too. How can i solve it?