return res;
			public void isValid(Object[] selection, StatusInfo res) {				for (int i= 0; i < selection.length; i++) {					if (!(selection[i] instanceof IPackageFragment)) {						res.setError(JarPackagerMessages.getString("JarManifestWizardPage.error.mustContainPackages")); //$NON-NLS-1$						return;					}				}				res.setOK();			}