Organization Hierarchy SharePoint web part.

Organization hierarchy web part shown on the profiles page of SharePoint My Site is defined in the person.aspx page of the SPSMSITEHOST site template (12 hive\TEMPLATE\SiteTemplates).

<SPSWC:ProfileManages FrameType="None" id="ProfileManages" runat="server" />

in person.aspx is the line which renders the organization hierarchy web part. This is defined in "Microsoft.SharePoint.Portal" assembly and the namespace is "Microsoft.SharePoint.Portal.WebControls".