This class plugs in a new part of the ManagerEditor.
The class shows data obtained from the model.
The Editorpart is connected to the model using a content provider.
Holds the needed information to fill the right-click menu
with available attributes for the choosen Instance of a Concept.
The information is found by traversing the WSMONavigator tree from
the choosen Concept to the root of the Concept Tree, to include Inherited
Attributes.