Calling an admin block from xml layout issue

Question

This is the content of my custom module, config.xml file:

<adminhtml>
        <layout>
            <updates>
                <mymodule>
                    <file>homepage.xml</file>
                </mymodule>
            </updates>
        </layout>
    </adminhtml>

this is the content of the layout/homepage.xml file from

<?xml version="1.0"?>
<layout>
    <adminhtml_manage_index>
        <reference name="content">
            <block type="mynamespace_mymodule/adminhtml_banner" name="mynamespace_mymodule_banner" />
        </reference>
    </adminhtml_manage_index>
</layout>

This is the content of my controller Mynamespace/Mymodule/controllers/Adminhtml/ManageController.php

class Mynamespace_Mymodule_Adminhtml_ManageController extends Mage_Adminhtml_Controller_Action
{
    public function indexAction()
    {  
        $this->loadLayout();
        $this->_initAction()->renderLayout();
    } 
}

and the content of the Mynamespace/Mymodule/Block/Adminhtml/Banner.php

class Mynamespace_Mymodule_Block_Adminhtml_Banner extends Mage_Adminhtml_Block_Widget_Grid_Container
{
    public function __construct()
    {
        echo 1; exit();
//....
    }
}

My problem is that it doesn't access the block. I put an exit() there . But I cannot get there. Why ? What am I missing ? thx

Answer 1

Rename folder name "AdminHtml" => "Adminhtml"

Please replace from

<?xml version="1.0"?>
<layout>
    <adminhtml_manage_index>
        <reference name="content">
            <block type="mynamespace_mymodule/adminhtml_banner" name="mynamespace_mymodule_banner" />
        </reference>
    </adminhtml_manage_index>
</layout>

To

<?xml version="1.0"?>
<layout>
    <mymodule_adminhtml_manage_index>
        <reference name="content">
            <block type="mynamespace_mymodule/adminhtml_banner" name="mynamespace_mymodule_banner" />
        </reference>
    </mymodule_adminhtml_manage_index>
</layout>