void querySelected(SelectionChangedEvent event) {
IStructuredSelection selection = (IStructuredSelection) event.getSelection();
selectedIdentifier = (CannedQueryIdentifier) selection.getFirstElement();
IWizardContainer container = getContainer();
if (container != null && container.getCurrentPage() != null) {
container.updateButtons();
}
}
final class CannedButtonListener extends SelectionAdapter {