private void fillPerson()
{
    try
    {
        this.selectedPerson=new PersonController().getOne(NuInt.safeParse((this.txtIdPerson.getText())));
        if(this.selectedPerson.getId()!=0)
        {
            this.txtPersonName.setText(this.selectedPerson.getName());
            this.txtZoneName.setText(this.selectedPerson.getZona().getName());
            this.txtCompanyName.setText(this.selectedPerson.getCompany().getName());
        }
        else
        {
            this.txtPersonName.setText("");
            this.txtZoneName.setText("");
            this.txtCompanyName.setText("");
            this.txtIdPerson.requestFocus(); <------------------------------------------------------------------------ This produces the dual focus
        }

    }

    private class FocusListener implements ChangeListener<Boolean>
{
    private TripFrmController trip;
    public FocusListener(TripFrmController Trip)
    {
        this.trip=trip;
    }


    @Override
    public void changed(ObservableValue<? extends Boolean> ov, Boolean prevVal, Boolean newVal)
    {
        if (!newVal)
        {
            this.trip.fillPerson();
        }
    }

}

This code makes two TextField controls get focus at the same time.
Screenshot of the result:
http://i.stack.imgur.com/RszF9.png