AspectJ: Accessing field defined in aspect (how to access inter-type member?)

Question

I'm currently working with AspectJ the first time to get "my feet wet". I would like to add a new Button on my Main frame (class Main extends JFrame). This is what I have so far:

public aspect MainWipe {

  public static final String Main.wipeText = "Wipe";
  public Button Main.wipeButton;

  pointcut initAtoms() : execution(void Main.initAtoms());

  after() returning() : initAtoms() 
  {
      // Does not work, eclipse error message "wipeButton / wipeText can not be resolved to a variable"
      wipeButton = new Button(wipeText);
  }
}

The "Static crosscutting" of the String- as well of the Button-field works fine, but i would like to extend my initAtoms method which is defined in Main with the button's initialization. For this i would have to access the fields defined in the same aspect, which doesn't work for me.

How can I achieve this? Somehow I'm not able to access the String and the Button.

Thanks!

EDIT:

Here is some part of my Main class:

public class Main extends JFrame{
    private static final String lineText = "Line";
    Button lineButton;

    // Removed other methods / fields / controls

    public void initAtoms() {
        lineButton = new Button(lineText);
    }

    public void initContentPane() {
        toolPanel.add(lineButton);
    }
}