Bug fixes and some additional features

This release contains the following updates:

• Routed commands for showing and hiding the modal content.
• A bug fix which stops you from being able to navigate into the primary content with the keyboard cursor keys whilst the modal content is being shown.
• The element that is focused prior to the modal content being shown is now restored when the modal content is hidden.

1.0.0

This release includes the first build of the ModalContentPresenter control.