Hey guys, UI plugin API now supports SystemTreeSelectionChange event, which is fired whenever "System Tree" selection (currently selected tree node) is changed. Example usage: api.register({ SystemTreeSelectionChange: function(selectedNode) { // See SystemTreeItemType Java enum for all supported values var nodeType = selectedNode.type; // Defined only if selected node has an entity associated var associatedEntity = selectedNode.entity; var associatedEntityId = associatedEntity && associatedEntity.id; } }); More details in UI plugin wiki: http://www.ovirt.org/Features/UIPlugins#System_tree_node_selection Regards, Vojtech