Messages.showOkCancelDialog(messageText, messageCaption, Messages.getQuestionIcon())) {
for (Node node : nodesToBeDeleted) {
final Object nodeObject = graphBuilder.getNodeObject(node);
if (nodeObject != null) deleteProvider.deleteNode(nodeObject);
}
for (Edge edge : edgesToBeDeleted) {
final Object edgeObject = graphBuilder.getEdgeObject(edge);
if (edgeObject != null) deleteProvider.deleteEdge(edgeObject);