@NotNull
  private Content createThreadsContent() {
    XThreadsView stacksView = new XThreadsView(myProject, mySession);
    registerView(DebuggerContentInfo.THREADS_CONTENT, stacksView);
    Content framesContent = myUi.createContent(DebuggerContentInfo.THREADS_CONTENT, stacksView.getPanel(),
                                               XDebuggerBundle.message("debugger.session.tab.threads.title"), null,
                                               stacksView.getDefaultFocusedComponent());
    framesContent.setCloseable(false);
    return framesContent;
  }
@NotNull
  private Content createThreadsContent()