protected void addCheckListeners() {
for (Entry<GraphNode, CheckboxFigure> entry : selectionMap.entrySet()) {
final Element element = ((GSSElementGraphNode) entry.getKey())
.getElement();
entry.getValue().addCheckListener(new ICheckListener() {
@Override
public void unchecked() {
GraphNode node = getNodeForElement(element);
for (Object connection : node.getSourceConnections()) {