fetch frontendtemplates in magento backend

Controller.php

<?php
// maybe it is too much, but it works :-)
$design = Mage::getSingleton('core/design_package');
$design->setArea(Mage_Core_Model_Design_Package::DEFAULT_AREA)
		->setTheme(
				array(
					'layout' => Mage_Core_Model_Design_Package::DEFAULT_THEME,
					'template' => Mage_Core_Model_Design_Package::DEFAULT_THEME,
					'skin' => Mage_Core_Model_Design_Package::DEFAULT_THEME,
					'locale' => Mage_Core_Model_Design_Package::DEFAULT_THEME
				)
		)
		->setPackageName(YOUR_PACKAGE_NAME);