// assuming $page contains a valid page object
 
// get page template and type
$pt = PageTemplate::getByID($page->getPageTemplateID());
$ptt = PageType::getByID($page->getPageTypeID());
 
// get all contrrols
$controls = PageTypeComposerOutputControl::getList($ptt, $pt);
 
foreach($controls as $control) 
{
   $fls = PageTypeComposerFormLayoutSetControl::getByID($control->getPageTypeComposerFormLayoutSetControlID());
    // check if control has custom label
   if($fls->getPageTypeComposerFormLayoutSetControlCustomLabel() == "News Content") { 
 
      $bc = $fls->getPageTypeComposerControlObject();
        $bc->setPageTypeComposerFormLayoutSetControlObject($fls);
 
        // invoke protected function using reflection...
        $r = new ReflectionMethod('Concrete\Core\Page\Type\Composer\Control\BlockControl', 'getPageTypeComposerControlBlockObject');
        $r->setAccessible(true);
        $blk = $r->invoke($bc, $page);
 
        // render the block
        $blk->display();
   }      
}