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Thus, ''_screen'' object will be an instance of a ''Screen'' class. The ''_nextScreenButton'' object will be an instance of ButtonField class.
In the BB app any field object could specify a listener for changes to this field by invoking the method
''public void setChangeListener(FieldChangeListener listener)''
Each field can have only one change listener object. The param ''listener'' is the object to listen for field changes.
