_treeAPI = session.getSessionInternalFrame().getObjectTreeAPI();
final ActionCollection coll = getApplication().getActionCollection();
// Show users in the object tee.
_treeAPI.addExpander(DatabaseObjectType.SESSION, new SessionExpander());
_treeAPI.addExpander(IObjectTypes.USER_PARENT, new UserParentExpander(this));
// Tabs to add to the database node.
_treeAPI.addDetailTab(DatabaseObjectType.SESSION, new DatabaseStatusTab());
_treeAPI.addDetailTab(DatabaseObjectType.SESSION, new ProcessesTab());
_treeAPI.addDetailTab(DatabaseObjectType.SESSION, new ShowVariablesTab());