public class DownloadHandler extends AbstractHandler {
@Override
public Object execute(final ExecutionEvent event) throws ExecutionException {
final DownloadWizard w = new DownloadWizard();
final Shell shell = PlatformUI.getWorkbench().getActiveWorkbenchWindow().getShell();
final WizardDialog dialog = new WizardDialog(shell, w);
dialog.create();
dialog.open();
return null;