I have a custom admin module where I want to programatically create and share a wishlist.

I managed to create it programatically and to send the email (it arrives ok), but the "$wishlistBlock" and therefore, the email is empty.

I'm not such advanced in Magento yet, do I have to rewrite the model/modelresource/block or something like to get it working in my custom module? Tried a lot of different things, none worked.

This is the offending piece of code:

                        $emailModel = Mage::getModel('core/email_template');
                        $sharingCode = $wishlist->getSharingCode();
                        //this var returning empty
                        $wishlistBlock = Mage::getSingleton('core/layout')->createBlock('wishlist/share_email_items')->toHtml();

                        $emailModel->sendTransactional(
                            Mage::getStoreConfig('wishlist/email/email_template'),
                            Mage::getStoreConfig('wishlist/email/email_identity'),
                            $email,
                            null,
                            array(
                                'customer'       => $customer,
                                'salable'        => $wishlist->isSalable() ? 'yes' : '',
                                'items'          => $wishlistBlock,
                                'addAllLink'     => Mage::getUrl('*/shared/allcart', array('code' => $sharingCode)),
                                'viewOnSiteLink' => Mage::getUrl('*/shared/index', array('code' => $sharingCode)),
                                'message'        => $message
                            )
                        );

                        $wishlist->setShared(1);
                        $wishlist->save();

                        Mage::dispatchEvent('wishlist_share', array('wishlist' => $wishlist));
                        Mage::getSingleton('adminhtml/session')->addSuccess(
                            $this->__('Your Wishlist has been shared.')
                        );

Thanks in advance.