In the next minor update of our WPF and Silverlight XAML Controls, we've updated our Layout Control to support the newest Tile Layout options shipping as part of Windows 8.1, including Extra Small and Extra Large Tile Sizes and Group Header editing.
Learn more about the WPF and Silverlight XAML Layout Control using one of the following links:
WPF: http://www.devexpress.com/Products/NET/Controls/WPF/Layout/
Silverlight: http://www.devexpress.com/Products/NET/Controls/Silverlight/Layout/