JavascriptComponent: detach()

Hi there,
I wrote a subclass of AbstractJavaScriptComponent and it's working nicely. Now the problem is that I need to call a destroy method when the component is detached. I tried this:
  

public void detach() {
        callFunction("onDetach");
        super.detach();        
    }

And in my js connector (...-connector.js) :

this.onDetach = function() { ...destroy code... }

But the method is not called. The detach() method on the server side is reached properly but the onDetach() method on the javascript side is not reached. It seems that "callFunction(...)" is not executed anymore because the component is being detached?!
Can anyone help me?

PS: I am using Vaadin 7.6.4

Awesome, that works like a charm!

Andrea