Sample Magento administrative layout

magentostudy_news.xml

<?xml version="1.0"?>
<!--
/**
 * Magento backend layout
 *
 * @author Magento
 */
-->
<layout>
    <adminhtml_news_index>
        <reference name="content">
            <block type="magentostudy_news/adminhtml_news" name="news" />
        </reference>
    </adminhtml_news_index>

    <adminhtml_news_grid>
        <block type="magentostudy_news/adminhtml_news_grid" name="root"/>
    </adminhtml_news_grid>

    <adminhtml_news_new>
        <update handle="adminhtml_news_edit" />
    </adminhtml_news_new>

    <adminhtml_news_edit>
        <update handle="editor"/>
        <reference name="content">
            <block type="magentostudy_news/adminhtml_news_edit" name="news_edit" />
        </reference>
        <reference name="left">
            <block type="magentostudy_news/adminhtml_news_edit_tabs" name="news_edit_tabs">
                <block type="magentostudy_news/adminhtml_news_edit_tab_main" name="news_edit_tab_main" />
                <block type="magentostudy_news/adminhtml_news_edit_tab_content" name="news_edit_tab_content" />
                <block type="magentostudy_news/adminhtml_news_edit_tab_image" name="news_edit_tab_image" />
                <action method="addTab"><name>main_section</name><block>news_edit_tab_main</block></action>
                <action method="addTab"><name>content_section</name><block>news_edit_tab_content</block></action>
                <action method="addTab"><name>image_section</name><block>news_edit_tab_image</block></action>
            </block>
        </reference>
    </adminhtml_news_edit>
</layout>