How to programmatically add WPF binding between DependencyProperty objects on 2 separate windows

The problem I am having is probably very simple to solve, yet it seems tricky from beginner's perspective. I created 2 windows visible simultaneously, one with ListBox on it, another with TextBox. I would like to bind window1.ListBox.SelectedValue to window2.TextBox.Text property programmatically. I am not using value converters. The code is straightforward: ``` var binding = new Binding("SelectedValue"); binding.Source = window1.ListBox; // binding.Path = new PropertyPath(ListBox.SelectedValueProperty); var bound = window2.TextBox.SetBinding(TextBlock.TextProperty, binding); ``` I would like to bind using DependencyProperty instance instead of property name for performance reasons, but I also tried binding by name. Binding just does not work. You can download dummy VS2010 project here. This leads to another question - how to debug binding, which event (if any) to subscribe to detect Binding changes ?