How can I bind an ItemsControl.ItemsSource with a property in XAML?

Question

I have a simple window :

Answer 1

That's because the data context of your view hasn't been set. You could either do this in the code behind:

this.DataContext = this;

Alternatively, you could set the Window's DataContext to itself - DataContext="{Binding RelativeSource={RelativeSource Self}}"

You're much better off though investigating the MVVM design pattern, and using an MVVM framework.