// Create a tab and add and additional tab to the main tab.
int $windowId;
int $mainTab;
 
// First create a User Window to place the Control on
$windowId = `createWindow "MyWindow"`;
  
//create a main tab controller then add a second tab to the main tab
$mainTab = `createTab $windowId "Main" "Second" "Third" -sel 2`;
int $secondTab = `addTab $mainTab "Fourth"`;
int $activeTab = `getTabSelItem $mainTab`;
print $activeTab;