this is important to fix because the tree could be rather expensive to load - both in the resource and group view.
rev3821 - performance: only load the resource/group nav trees once per page, i.e. context menu loads/reloads no longer cause the tree to re-query the DB for resources or the cost of rebuilding the in-memory tree
Seems faster to me. rev3849
This bug was previously known as http://jira.rhq-project.org/browse/RHQ-2003