How can I make a WPF Expander Stretch?

Question

The Expander control in WPF does not stretch to fill all the available space. Is there any solutions in XAML for this?

Answer 1

The Silverlight Toolkit includes an Accordion control which acts like an expander that always stretches to the available space. I haven't tested it yet, but it might be functional for WPF too, like the Silverlight Chart controls.