/**
  * Enable or disable a tab, or all tabs.
  *
  * @param null|string|integer $mixTab  If null, enables or disables all tabs. Otherwise, the name or index of a tab.
  * @param bool $blnEnable True to enable tabs. False to disable.
  */
 public function EnableTab($mixTab = null, $blnEnable = true)
 {
     if (is_null($mixTab)) {
         if ($blnEnable) {
             parent::Enable();
         } else {
             parent::Disable();
         }
         return;
     }
     if (false !== ($i = $this->FindTabIndex($mixTab))) {
         if ($blnEnable) {
             parent::Enable1($i);
         } else {
             parent::Disable1($i);
         }
     }
 }