}
private final void checkOpen(final Callback <Boolean> callback) {
final Workbench wb = (Workbench) Registry.get(Workbench.ID);
if (wb.getCurrentEditor() != viewEditor) {
wb.checkOpen(viewEditor, new Callback<Boolean>() {
public void onFailure(Throwable t) {
callback.onSuccess(true);
}
public void onSuccess(Boolean result) {