@Override
  protected void actionPerformed(AnActionEvent e, ViewContext context, Content[] content) {
    ContentManager manager = context.getContentManager();
    for (Content c : manager.getContents()) {
      if (c.isCloseable() && isAccepted(c, content)) {
        manager.removeContent(c, context.isToDisposeRemovedContent());
      }
    }
  }
@Override
  protected void actionPerformed(AnActionEvent e, ViewContext context, Content[] content)