right side bar not display

Question

I want to display products in registration side bar. i have added reference to customer.xml.

 <customer_account_index translate="label">
        <label>Customer My Account Dashboard</label>
         <reference name="right">
            <block type="reports/product_viewed" name="right.reports.product.viewed" template="catalog/product/list/featured.phtml" />
        </reference>
        <update handle="customer_account"/>
        <!-- Mage_Customer -->
        <reference name="root">
            <action method="setTemplate"><template>page/2columns-right.phtml</template></action>
        </reference>
        <reference name="my.account.wrapper">
            <block type="customer/account_dashboard" name="customer_account_dashboard" template="customer/account/dashboard.phtml">
                <block type="customer/account_dashboard_hello" name="customer_account_dashboard_hello" as="hello" template="customer/account/dashboard/hello.phtml"/>
                <block type="core/template" name="customer_account_dashboard_top" as="top" />
                <block type="customer/account_dashboard_info" name="customer_account_dashboard_info" as="info" template="customer/account/dashboard/info.phtml"/>
                <block type="customer/account_dashboard_newsletter" name="customer_account_dashboard_newsletter" as="newsletter" template="customer/account/dashboard/newsletter.phtml"/>
                <block type="customer/account_dashboard_address" name="customer_account_dashboard_address" as="address" template="customer/account/dashboard/address.phtml"/>
            </block>
        </reference>

    </customer_account_index>

but side bar is not display.

Answer 1

Of course it won't display; did you notice:

<reference name="root">
    <action method="setTemplate"><template>page/2columns-right.phtml</template></action>
</reference>

This template will not render the right column. You need to change the template to page/3columns.phtml.

However, you should not do any of this in customer.xml. Your module should specify its own update file, and then you can do both in there:

<customer_account_index>
    <reference name="root">
        <action method="setTemplate"><template>page/3columns.phtml</template></action>
    </reference>
    <reference name="right">
        <block type="reports/product_viewed" name="right.reports.product.viewed" template="catalog/product/list/featured.phtml" />
    </reference>
</customer_account_index>