public void contentRemoved(ContentManagerEvent event) {
   if (event.getContent() == myContent) {
     myContentManager.removeContentManagerListener(this);
     AntBuildMessageView buildMessageView = myContent.getUserData(KEY);
     if (!myCloseAllowed) {
       buildMessageView.stopProcess();
     }
     ProjectManager.getInstance().removeProjectManagerListener(myProject, this);
     myContent.release();
     myContent = null;
     buildMessageView.myBuildFile = null;
     buildMessageView.myPlainTextView.dispose();
   }
 }
  public int addTab(
      String s,
      JComponent component,
      boolean selectTab,
      boolean replaceContent,
      boolean lockable,
      boolean addDefaultToolbar,
      @Nullable final ActionGroup toolbarActions,
      @NonNls String helpId) {

    int existing = getComponentNumNamed(s);
    if (existing != -1) {
      Content existingContent = getContentManager().getContent(existing);
      final JComponent existingComponent = existingContent.getComponent();
      if (existingComponent instanceof DeactivateListener) {
        ((DeactivateListener) existingComponent).deactivated();
      }
      if (!replaceContent) {
        getContentManager().setSelectedContent(existingContent);
        return existing;
      } else if (!existingContent.isPinned()) {
        getContentManager().removeContent(existingContent, true);
        existingContent.release();
      }
    }

    CvsTabbedWindowComponent newComponent =
        new CvsTabbedWindowComponent(
            component, addDefaultToolbar, toolbarActions, getContentManager(), helpId);
    Content content =
        ContentFactory.SERVICE
            .getInstance()
            .createContent(newComponent.getShownComponent(), s, lockable);
    newComponent.setContent(content);
    getContentManager().addContent(content);

    return getComponentAt(getContentManager().getContentCount() - 1, selectTab);
  }