private void createUIComponents() {
    myValuePattern = new LanguageTextField(RegExpLanguage.INSTANCE, myProject, myOrigInjection.getValuePattern(), new LanguageTextField.SimpleDocumentCreator() {
      @Override
      public void customizePsiFile(PsiFile psiFile) {
        psiFile.putCopyableUserData(ValueRegExpAnnotator.KEY, Boolean.TRUE);
      }
    });

    // don't even bother to look up the language when xpath-evaluation isn't possible
    final XPathSupportProxy proxy = XPathSupportProxy.getInstance();
    myXPathCondition = new LanguageTextField(proxy != null ? InjectedLanguage.findLanguageById("XPath") : null, myProject,
                                             myOrigInjection.getXPathCondition(), new LanguageTextField.SimpleDocumentCreator() {
        @Override
        public void customizePsiFile(PsiFile psiFile) {
          // important to get proper validation & completion for Jaxen's built-in and PSI functions
          // like lower-case(), file-type(), file-ext(), file-name(), etc.
          if (proxy != null) {
            proxy.attachContext(psiFile);
          }
        }
      });
  }
private void createUIComponents()