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Add block functionality to another block

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Hi, I'm trying to add a breadcrumb into a banner than I've made with Designer Content. I've put the breadcrumb php code into my block which is:

$navItems = $controller->getNavItems(true);
for ($i = 0; $i < count($navItems); $i++) {
   $ni = $navItems[$i];
   if ($i > 0) {
      echo ' <span class="ccm-autonav-breadcrumb-sep">></span> ';
   }
   if ($ni->isCurrent) {
      echo $ni->name;
   } else {
      echo '<a href="' . $ni->url . '" target="' . $ni->target . '">' . $ni->name . '</a>';
   }
}


And added the classes from the autonav controller into my controller after tweaking their names so that they aren't redeclared:

class AutonavBlockControllerCustom extends Concrete5_Controller_Block_Autonav { }
class AutonavBlockItemCustom extends Concrete5_Controller_Block_AutonavItem { }


and I'm getting the following error:

Fatal error: Call to undefined method BannerWithTextBlockController::getNavItems() in /home/www/dev/www.bedrockdrilling.co.uk/blocks/banner_with_text/view.php on line 2


Anyone know why I might be getting this since all I'm doing is copying the autonav functionality?

Thank you in advance!