So I think I'm doing something pretty basic. I know why this doesn't work, but it seems like there should be a straight foward way to make it work.

code:

private string fooImageRoot;
 // ....
 public BitmapImage FooImage
 {
  get
  {
   URI imageURI = new URI(Path.Combine(fooImageRoot, CurrentFooTypes.FooObject.FooImageName));
   return imageURI;
  }
 }

So CurrentFOoTypes and FooObject also supports INotifyPropertyChanged.

So If I bind a TextBlock to CurrentFooTypes.FooObject.FooImageName, if either fooObject or FooImageName change the textblock updates. How can I subscribe my viewmodel object to recieve updates in a similiar fasion.