How do I customise the behaviour of the asp:SiteMapPath to not show the root siteMapNode as a part of the breadcrumb.

Code:
<siteMapNode title="Root"…>
   <siteMapNode title="Level_1_1"…>
   </siteMapNode>
   <siteMapNode title="Level_1_2"…>
      <siteMapNode title="Level_2_1"…>
      </siteMapNode>
   </siteMapNode>
</siteMapNode>
Shold in the breadcrumb look like: Level_1_2 > Level_2_1
and not: Root > Level_1_2 > Level_2_1