[CS3] WLBCmpEyeballObserver::Update() - How to get NodeID?

Question

How do you get access to NodeID (and hence the internal data) at user action on a widget in Node widget. WLBCmpEyeballObserver::Update() stops short at displaying an alert box.
void WLBCmpEyeballObserver::Update
     const ClassID& theChange,
     ISubject* theSubject,
     const PMIID &protocol,
     void* changedBy
     if(theChange == kTrueStateMessage) {
          // Then the button has been activated.
          do {
                    PMString dbgInfoString("WLBCmpEyeballObserver::Update() ");
                    dbgInfoString.SetTranslatable(kFalse);     // only for debug- not real code
                    CAlert::InformationAlert(dbgInfoString);
          } while(0);
I tried following so far:
void WLBCmpEyeballObserver::Update
     const ClassID& theChange,
     ISubject* theSubject,
     const PMIID &protocol,
     void* changedBy
     do
          InterfacePtr<IControlView> controlView(theSubject, UseDefaultIID());
          // Get the button ID from the view.
          WidgetID theSelectedWidget = controlView->GetWidgetID();
          if (theSelectedWidget == kWLBCmpListElementEyeballWidgetID
               && theChange == kTrueStateMessage)
               // 1st approach - Following returns null
               InterfacePtr<ITreeNodeIDData> nodeData(this, UseDefaultIID());
               TreeNodePtr<WLBCmpNodeID> nodeID(nodeData->Get());
               // 2nd approach - I do get the controller.
               // But its of no use since my row isn't selected
               InterfacePtr<IWidgetParent> widgetParent(controlView, UseDefaultIID());
               InterfacePtr<ITreeViewController> controller(static_cast<ITreeViewController*>(
                    widgetParent->QueryParentFor(ITreeViewController::kDefaultIID)));
               NodeIDList selectedItems;
               controller->GetSelectedItems(selectedItems);
               const int kSelectionLength =  selectedItems.size() ;
               if (kSelectionLength> 0 )
                    K2Vector<NodeID>::const_iterator iter;
                    for(iter = selectedItems.begin(); iter != selectedItems.end(); ++iter) {
                         const WLBCmpNodeID* oneNode = static_cast<const WLBCmpNodeID*>(iter->Get());
     } while (false);

Answer 1

Allright finally got it to work. Trick was to get panel control data > find node widget > get node data
void WLBCmpEyeballObserver::Update
     const ClassID& theChange,
     ISubject* theSubject,
     const PMIID &protocol,
     void* changedBy
     do
          InterfacePtr<IControlView> eyeballControlView(theSubject, UseDefaultIID());
          // Get the button ID from the view.
          WidgetID theSelectedWidget = eyeballControlView->GetWidgetID();
          if (theSelectedWidget == kWLBCmpListElementEyeballWidgetID
               && theChange == kTrueStateMessage)
               // Get parent of eyeball widget
               InterfacePtr<IWidgetParent> eyeBallWidgetParent(eyeballControlView, UseDefaultIID());
               // Get control view of parent - just in case they are different
               InterfacePtr<IControlView> nodeWidgetControlView(eyeBallWidgetParent, UseDefaultIID());
               // Get the panel control data of parent widget
               InterfacePtr<IPanelControlData> panelControlData(
                    (IPanelControlData*)(eyeBallWidgetParent->QueryParentFor(IPanelControlData::kDefaultIID)));
               ASSERT(panelControlData);
               if (!panelControlData) break;
               // find the node widget id from panel control data
               IControlView* parentWidgetControlView =
                    panelControlData->FindWidget(kWLBCmpListParentWidgetId);
               // Get the node data. This is not null
               InterfacePtr<ITreeNodeIDData> nodeData(parentWidgetControlView, UseDefaultIID());
               TreeNodePtr<WLBCmpNodeID> wlbCmpNodeID (nodeData->Get());
     } while (false);