I'll try to be more descriptive here.
A Few Q's:

1. using:
   var foo = new Foo() { Bar = new Bar() { Value = "Value" } };
   var value = DataBinder.Eval(foo, "Bar.Value");
   Or: This one
   It is possible to retrieve an internal nested property using property path syntax. Is there a way to set/trigger a nested property (a regular property not DependencyProperty) easily with some kind of simple mechanisms as described here? I want to acheive something like:
   string newValue = "Hello World!";
   DataBinder.EvalSet(foo, "Bar.Value", NewValue);

2. Is there any mechanism that support both property path (for nested objects) and XPATHs (if the objects are XPATH navigable of course) ? again, that supports get and set options.

Thanks, DD