anchor.diff:  Besides the convoluted binding on the ``textArea``'s text property (unfortunately text is not a bound property) the other
   special pieces of code found in this class are the usages of the _parentView_ field. Notice the that the type is set to
   `ContainerView`, this means this View is aware that it's not a top level MVC group, that is, there will be another
  -MVC group that will be responsible for instantiating `editor`, in this case is the `container` MVC group. A parent/child
  +MVC group that is responsible for instantiating `editor`, in this case it is the `container` MVC group. A parent/child
   relationship is established between the two MVC group instances when this happens. More information about this
   relationship can be found at the link:/guide/latest/index.html#_mvc_mvc_group_relationships[guide, window="_blank"].
   
  
positive.code: 
  Notice that the _documentModel_ property is declared as final; this means it will always have the same value, thus we
  can use it to create stable bindings. This is the reason for making `DocumentModel` a subclass of `Document`. As you
  can see the former listens to changes on the latter and copying the values over. This happens very time the application
  changes the value of _documentModel.document_ due to the ``PropertyChangeListener``s that were put into place.
  
  The final remark on this model class is that it implements the `javax.swing.event.ChangeListener` interface. In this
  way the model instance can listen to tab selection changes and update the _documentModel_ property.
  
  Let's mode to the View. Open up `ContainerView.java` and paste the following into it
  
  [source,java,options="nowrap"]
  .griffon-app/views/editor/ContainerView.java
  
negative.code:  * MVC Group parent-child relationships
   * MVC Group lifecycle
  
  The goal of the Editor application shown here is to provide basic editing capabilities for text files. Each
  file will be handled by its own tab; tabs will be located inside a tab container.
  
  . <<_tutorial_2_1,Creating an Editor application>>
  