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();
   }
 }