public void updateTargetClass() {
      final PsiManager manager = PsiManager.getInstance(myProject);
      myTargetClass =
        JavaPsiFacade.getInstance(manager.getProject()).findClass(getTargetClassName(), GlobalSearchScope.projectScope(myProject));
      myTable.fireExternalDataChange();
      myIntroduceEnumConstants.setEnabled(myTargetClass != null && myTargetClass.isEnum());
    }
public void updateTargetClass()