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();
   }
 }
 @Override
 public void contentRemoved(ContentManagerEvent event) {
   if (event.getContent() == myContent) {
     synchronized (myMessageViewLock) {
       if (myErrorTreeView != null) {
         myErrorTreeView.dispose();
         myErrorTreeView = null;
         if (myIndicator.isRunning()) {
           cancel();
         }
         if (AppIcon.getInstance().hideProgress(myProject, "compiler")) {
           AppIcon.getInstance().setErrorBadge(myProject, null);
         }
       }
     }
     myContentManager.removeContentManagerListener(this);
     myContent.release();
     myContent = null;
   }
 }