See sub-tasks for specific work items.
r2691 is a first rev of a JSF component for the group config property "drilldown" page, along with a test xhtml (/rhq/test/config/props.xhtml) for demonstrating it. The two columns in the property value table that is rendered are supposed to be sortable, but for some reason, the sorting is not working (clicking on the column headers shows the ajax in-progress indicator, but does nothing).
This bug was previously known as http://jira.rhq-project.org/browse/RHQ-1386
Closed per triage