Problems with button setTabIndex(-1)

Hi,

I have a class component to simulate steeper.

component (TextField and button spin with tabIndex -1):

package br.com.componentes;

import com.vaadin.server.FileResource;
import com.vaadin.server.ThemeResource;
import com.vaadin.server.VaadinService;
import com.vaadin.ui.*;
import com.vaadin.ui.themes.Reindeer;
import java.io.File;

public class Stepper extends CustomComponent {
private AbsoluteLayout mainLayout;

private TextField edit;
private Button btn;

public Stepper(String caption) {
    init();
    edit.setCaption(caption);
}

private void init(){
    mainLayout = new AbsoluteLayout();
    super.setCompositionRoot(mainLayout);    
    super.setHeight("40");
    
    edit = buildEdit();
    mainLayout.addComponent(edit,"top:13;left:0");

    btn = buildButton();
    mainLayout.addComponent(btn, "top:10;left:63");

    reposicionar();
}

private TextField buildEdit(){
    edit = new TextField();

    edit.setWidth("60");
    edit.setImmediate(true);
    edit.setNullRepresentation("");

    return edit;
}

private Button buildButton(){
    btn = new Button();

    btn.setTabIndex(-1);
    btn.setStyleName(Reindeer.BUTTON_LINK);
    btn.setIcon(new FileResource(new File(
            VaadinService.getCurrent().getBaseDirectory().getAbsolutePath()
                        +"\\VAADIN\\themes\\printonline\\images\\spin_26x16.png")));
    btn.setWidth("20");
    btn.setHeight("26");

    return btn;
}

public void reposicionar() {
    mainLayout.getPosition(btn).setLeftValue(edit.getWidth()+3);
    super.setWidth(String.valueOf(edit.getWidth()+btn.getWidth()+3));
    mainLayout.setWidth(String.valueOf(super.getWidth()));
}    

}

main:

import br.com.componentes.Stepper;
import com.vaadin.annotations.Theme;
import com.vaadin.server.;
import com.vaadin.ui.
;

public class Main extends UI {

@Override
protected void init(VaadinRequest request) {
    VerticalLayout vl = new VerticalLayout();
    vl.addComponent(new Stepper("Stepper")); //===> WORKS, the button don´t receive a focus
    setContent(vl);
    
    Window w = new Window();
    w.center();
    
    VerticalLayout content = new VerticalLayout();
    content.addComponent(new Stepper("Stepper"));  //===> IN WINDOW DON´T WORKS, the button receive a focus
    w.setContent(content);
    
           
    addWindow(w);
}

}

when I insert the component in application the button don´t receive a focus.

When I insert the component in a window the button receives focus, even though the property tabindex -1.

This is a bug?

Thanks.

Anyone know how to solve this?

This is a bug?

Thanks.