@Override
				public void valueChanged(ListSelectionEvent e) {
					// TODO Auto-generated method stub
					try{
						if(relationJL.hasFocus())
							relationJL.clearSelection();
						if(aggregationJL.hasFocus())
							aggregationJL.clearSelection();
						if(generalizationJL.getSelectedValue().toString().equalsIgnoreCase(g.getIdentifier()))
							detailsJL.setListData(fillGenDetails(g,model).toArray());
					}catch(NullPointerException exp){
					}
				}});