Implement logic for canPropagate...

Source/NSTabViewController.m

@@ -121,6 +121,14 @@
 - (void) setSelectedTabViewItemIndex: (NSInteger)idx
 {
   [[self tabView] selectTabViewItemAtIndex: idx];
+  if (_canPropagateSelectedChildViewControllerTitle)
+    {
+      NSString *title = [[[self tabView] tabViewItems] objectAtIndex: idx];
+      if (title != nil)
+        {
+          [self setTitle: title];
+        }
+    }
 }
 
 // Responding to tabview actions...

Source/NSViewController.m

@@ -84,6 +84,11 @@
 
 - (void)setTitle:(NSString *)title
 {
+  NSWindow *w = [[self view] window];
+  if (w != nil)
+    {
+      [w setTitle: title]; // sync title with window...
+    }
   ASSIGN(_title, title);
 }