code: private String getBaseTabPanelPath() {
          String selector = getPathBuilder().getBasePath();
          WebLocator child = new WebLocator().setClasses(iconCls);
          WebLink activeTab = new WebLink().setClasses("x-tab-active").setChildNodes(child);
          selector = selector + (Strings.isNullOrEmpty(iconCls) ? "" : " and count(." + activeTab.getXPath() + ") > 0");
          return getPathBuilder().getRoot() + getPathBuilder().getTag() + "[" + selector + "]";
      }
docs: this method return the path of the main Tab (that contains also this Tab/Panel)
  
  @return the path of the main TabPanel