Change ICN contentViewer's tab title in split pane mode?

I need to change the "title" for each document shown in ICN Viewer, dynamically, at runtime. I'll read the new viewer tab title from the document properties

ENVIRONMENT: ICN 2.0.3 CM8.5 WAS 8.5.5

CODE SO FAR:

  1. I found a PARTIAL solution by hooking "ecm.model.desktop, onChange":

    aspect.after(ecm.model.desktop, 'onChange', function() {
       var contentViewer = dijit.byId('contentViewer');
       if (contentViewer) {
          var viewerTabTitleDef = new ViewerTabTitleDef ();
          contentViewer.mainTabContainer.getChildren().forEach(function(child) {
             viewerTabTitleDef.changeTitle(viewerTabTitleDef.self,
                child.controlButton, child.contentViewerPane.viewerItem.item);
          });
          ...
    
  2. I was able to extend this for subsequent documents opened in the same viewer, and optimized by "removing()" the handler after this initial call. Here is the complete code:

    var kill = aspect.after(ecm.model.desktop, 'onChange', function() {
    
       var contentViewer = dijit.byId('contentViewer');
       // "contentViewer" will be "unknown" unless viewer invoked
       console.log('onChange: contentViewer', contentViewer);  
    
       if (contentViewer) {
          console.log("new ViewerTabTitleDef()...");
          kill.remove();
          var viewerTabTitleDef = new ViewerTabTitleDef ();
          contentViewer.mainTabContainer.getChildren().forEach(function(child) {
              // For initially opened tabs
              console.log('initially opened: child', child);
              viewerTabTitleDef.changeTitle(viewerTabTitleDef.self, child.controlButton, child.contentViewerPane.viewerItem.item);
          });
          aspect.after(contentViewer.mainTabContainer, 'addChild', function(child) {
              // For tabs added after the viewer was opened
              console.log('subsequently opened: child', child);
              viewerTabTitleDef.changeTitle(viewerTabTitleDef, child.controlButton, child.contentViewerPane.viewerItem.item);
          }, true);
       } // end if contentViewer
    
    });  // end aspect.after(onChange desktop)
    
  3. CURRENT PROBLEM:

    Q: How can I change the label for a split tab (either vertical or horizontal)?

    So far, I have NOT been able to find any event for any ICN/ECM widget or object variable that I can trigger on.

Thank you in advance!