Bind StringCollection to a ListBox

[Speedo]

Can anyone give me an example of how to set this up when the StringCollection is a class member? I've been able to get it to work with a StringCollection that's in project settings, but can quite get it right in the case where it's a member of the class.

Edit: Apparently StringCollection doesn't support two way binding, so I've switch to a ObservableCollection<string>.

Just to be clear, I need something like this:

CS

public partial class MyWindow : Window
{
  private ObservableCollection<string> mystrings;

  ...
}

XAML

<Window x:Class="MyWindow"
...

  <ListBox ItemsSource="{Binding ??? what here ???, Mode="TwoWay"}"/>
</Window>