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