Im trying to add a button to the order view page on the admin, next on the credit memo for example or something similiar, but is not showing the button, and i have no idea how to test it to find the problem.

Here is my code, maybe someone can notice any problem.

config.xml

<config>     <modules>         <Cloud_Magni>             <version>0.1.0</version>         </Cloud_Magni>     </modules>     <global>         <models>             <magni>                 <class>Cloud_Magni_Model</class>             </magni>         </models>           <resources>              <invoicedocs_setup>                 <setup>                     <module>Cloud_Magni</module>                     <class>Cloud_Magni_Model_Resource_Mysql4_Setup</class>                 </setup>                 <connection>                     <use>core_setup</use>                 </connection>             </invoicedocs_setup>               <invoicedocs_write>                 <connection>                     <use>core_write</use>                 </connection>             </invoicedocs_write>             <invoicedocs_read>                 <connection>                     <use>core_read</use>                 </connection>             </invoicedocs_read>         </resources>          <blocks>             <magnifi>                 <class>Cloud_Magni_Block</class>             </magnifi>          <adminhtml>             <rewrite>                 <sales_order_view>Cloud_Magni_Block_Adminhtml_Sales_Order_View</sales_order_view>             </rewrite>         </adminhtml>         </blocks>          <helpers>             <magnifi>                 <class>Cloud_Magni_Helper</class>             </magnifi>         </helpers>         <events>               <sales_order_invoice_pay>                 <observers>                     <magni>                         <type>model</type>                         <class>magni/observer</class>                         <method>createInvoice</method>                     </magni>                 </observers>             </sales_order_invoice_pay>               <sales_order_creditmemo_save_after>                 <observers>                     <magni>                         <type>model</type>                         <class>magni/observer</class>                         <method>createCredit</method>                     </magni>                 </observers>             </sales_order_creditmemo_save_after>         </events>     </global> </config> 

View.php:

class Cloud_Magni_Block_Adminhtml_Sales_Order_View extends Mage_Adminhtml_Block_Sales_Order_View {     public function  __construct() {          parent::__construct();          $  this->_addButton('magni', array(             $  message = "are you sure?",             'label'     => Mage::helper('Sales')->__('Segunda Fatura'),             'onclick'   => "confirmSetLocation('{$  message}','{$  this->getUrl('Cloud_Magni')}')"         ));     } }