Как правильно внести правки в административный контроллер

<config>
	<global>
		<rewrite>
		    <df_adminhtml_system_convert_profile>
		        <from><![CDATA[#^/[^/]+/system_convert_profile/#]]></from>
		        <to>/df_adminhtml/system_convert_profile/</to>
		    </df_adminhtml_system_convert_profile>
		</rewrite>	
	</global>
	
    <admin>
        <routers>
            <df_adminhtml>
                <use>admin</use>
                <args>
                    <module>Df_Adminhtml</module>
                    <frontName>df_adminhtml</frontName>
                </args>
            </df_adminhtml>
        </routers>
    </admin>	
</config> 

<config>
	<admin>
		<routers>
			<adminhtml>
				<args>
					<modules>
						<Df_Adminhtml before="Mage_Adminhtml">Df_Adminhtml</Df_Adminhtml>
					</modules>
				</args>
			</adminhtml>
		</routers>
	</admin>	
</config> 

<?xml version="1.0"?>
<config>
    <modules>
        <Lindenvalley_Density>
            <version>0.1.0</version>
        </Lindenvalley_Density>
    </modules>

    <global>
        <models>
            <density>
                <class>Lindenvalley_Density_Model</class>
            </density>
        </models>

		<resources>
            <density_setup>
                <setup>
                    <module>Lindenvalley_Density</module>
					<class>Mage_Catalog_Model_Resource_Eav_Mysql4_Setup</class>
                </setup>
                <connection>
                    <use>core_setup</use>
                </connection>
            </density_setup>
			
            <density_write>
                <connection>
                    <use>core_write</use>
                </connection>
            </density_write>
			
            <density_read>
                <connection>
                    <use>core_read</use>
                </connection>
            </density_read>
        </resources>
		
		<helpers>
             <density>
                <class>Lindenvalley_Density_Helper</class>
             </density>
        </helpers>
		
       <blocks>
             <density>
                <class>Lindenvalley_Density_Block</class>
             <density>
	</blocks>
    </global>	
	<admin>
        <routers>
            <density>
                <args>
                    <modules>
                        <Lindenvalley_Density before="Mage_Adminhtml">Lindenvalley_Density</Lindenvalley_Density>
                    </modules>
                </args>
            </density>
        </routers>
    </admin>     
</config>

<?php 
require_once 'Mage/Adminhtml/controllers/Catalog/ProductController.php';

class Lindenvalley_Density_Catalog_ProductController extends Mage_Adminhtml_Catalog_ProductController
{
	public function _construct()
	{
		parent::_construct();
	}
	
	public function saveAction()
        {
        
		parent::saveAction();
	
		echo "Hello";
        }
}

parent::_construct();

die("hello");

<admin>
        <routers>
            <adminhtml>
                <args>
                    <modules>
                        <Lindenvalley_Density before="Mage_Adminhtml">Lindenvalley_Density_Catalog</Lindenvalley_Density>
                    </modules>
                </args>
            </adminhtml>
        </routers>
    </admin>