public class PM7LTypes extends Panel{ 

     public PM7LTypes(){
     ...
     ...
     CheckBox cb1 = new CheckBox ("Caption1");
     cb1.addValueChangeListener(new Property.ValueChangeListener() {
            @Override
            public void valueChange(Property.ValueChangeEvent valueChangeEvent) {
               .....
               .....
            }
        });

     CheckBox cb2 = new CheckBox ("Caption2");
     cb2.addValueChangeListener(new Property.ValueChangeListener() {
            @Override
            public void valueChange(Property.ValueChangeEvent valueChangeEvent) {
               .....
               .....
            }
        });

     }

}

PM7LTypes myPM = new PM7LTypes();
myPM.addChangeListener(new ChangeListener(){
     @Override
      public void Change(Property.ChangeEvent changeEvent) {
         //Код срабатываемый после изменения cb1 и cb2     
       }
});

        public void addValueChangeListener(Property.ValueChangeListener listener){
        cb1.addValueChangeListener(listener);
        cb2.addValueChangeListener(listener);
        cb3.addValueChangeListener(listener);
        cb4.addValueChangeListener(listener);
        cb5.addValueChangeListener(listener);
        cb6.addValueChangeListener(listener);
        cb7.addValueChangeListener(listener);
    }