fUseSourceFoldersCheckbox.setEnabled(fJarPackage.areJavaFilesExported() && !fJarPackage.areClassFilesExported());
	protected void updatePageCompletion() {		boolean pageComplete= isPageComplete();		fUseSourceFoldersCheckbox.setEnabled(fJarPackage.areJavaFilesExported() && !fJarPackage.areClassFilesExported());		setPageComplete(pageComplete);		if (pageComplete) {			setErrorMessage(null);		}	}