calling sidebar for product detail page only

Question

i want to call my custom siderbar on product detail page only below is code i am using in admin > categroy > custom design

<reference name="left">
      <block type="core/template" name="Designer Sidebar"  template="page/design/sidebar.phtml"/>
</reference>

but it add sidebar on all pages how to restrict it for product detail page only as now my custom sidebar also show on product listing page i do not want it there

based marius answer i update my code to below:in admin > category > custom design

<catalog_product_view>
<reference name="left">
      <block type="core/template" name="Designer Sidebar"  template="page/design/sidebar.phtml"/>
</reference>
</catalog_product_view>

but after that i do not see sidebar.phtml there

Answer 1

You can restrict it to the product pages by entering the xml in the layout update section of each product (but that's wrong and time consuming) or you can add this in one of your layout xml files:

<catalog_product_view>
    <reference name="left">
      <block type="core/template" name="Designer Sidebar"  template="page/design/sidebar.phtml"/>
    </reference>
</catalog_product_view>