Solved by adding the below content to a CEWP on the page with organization browser:
<script type="text/javascript">
function CreateHierarchyChartControl(parentId, profileId, type, persistControlId) {
var i = profileId.indexOf("|");
var claimsmode = profileId.substr(i-1,1);
if((i >=0 ) & (claimsmode=="w"))
{
profileId = profileId.substr(i+1,profileId.length-i-1);
var initParam = profileId + ',' + type + ',' + persistControlId;
var host = document.getElementById(parentId);
host.setAttribute('width', '100%');
host.setAttribute('height', '100%');
Silverlight.createObject('/_layouts/ClientBin/hierarchychart.xap',
host,
'ProfileBrowserSilverlightControl',
{
top: '30',
width: '100%',
height: '100%',
version: '2.0',
isWindowless: 'true',
enableHtmlAccess: 'true'
},
{
onLoad: OnHierarchyChartLoaded
},
initParam,
null);
}
}
</script>`
where profileId (DOMAIN\user) sets the top-level profile for the organization browser (which is on the same page).
Reference: