EDIT

import org.eclipse.core.commands.AbstractHandler;

import org.eclipse.core.commands.ExecutionEvent;

import org.eclipse.core.commands.ExecutionException;

import org.eclipse.jface.dialogs.MessageDialog;

import org.eclipse.jface.viewers.ISelection;

import org.eclipse.jface.viewers.IStructuredSelection;

							DeleteConfiguratorDialog dialog = new DeleteConfiguratorDialog(config, HandlerUtil.getActiveShell(event), "Confirm Deletion",  null,  "Do you really want to delete the name?", MessageDialog.WARNING, new String[] { "Delete", "Skip" }, 0);

							int result_dialog= dialog.open();

								return null;

							}

							result = service.delete(((TaxonNameBase) object).getUuid(), config);

								if (((Taxon)object).getTaxonNodes().isEmpty()){

								    dialog = new DeleteConfiguratorDialog(config, HandlerUtil.getActiveShell(event), "Confirm Deletion",  null,  "Do you really want to delete the taxon?", MessageDialog.WARNING, new String[] { "Delete", "Skip" }, 0);

								    int result_dialog= dialog.open();

	                                    return null;

	                                }

	                                result = service.deleteTaxon(((TaxonBase) object).getUuid(), config, null);

								SynonymDeletionConfigurator config = new SynonymDeletionConfigurator();

								DeleteConfiguratorDialog dialog = new DeleteConfiguratorDialog(config, HandlerUtil.getActiveShell(event), "Confirm Deletion",  null,  "Do you really want to delete the synonym?", MessageDialog.WARNING, new String[] { "Delete", "Skip" }, 0);

                                int result_dialog= dialog.open();

                                     return null;

                                }

								result = service.deleteSynonym(((Synonym)object).getUuid(), config);