[WPF] Binding to application settings using a markup extension

Hi, this is my first post on this blog, I hope you will enjoy it ;-). If you want to know a few things about me, please check out this page. The end-user of any application expects that his preferences (window size, state of this or that option…) are saved to be restored at the next run : that's why .NET 2.0 introduced application settings as a unified way to persist these settings.