MediaElement Stretch: Stretch.Fill
<UserControl x:Class='SilverlightApplication3.MainPage' xmlns='http://schemas.microsoft.com/winfx/2006/xaml/presentation' xmlns:x='http://schemas.microsoft.com/winfx/2006/xaml' xmlns:d='http://schemas.microsoft.com/expression/blend/2008' xmlns:mc='http://schemas.openxmlformats.org/markup-compatibility/2006' mc:Ignorable='d' d:DesignWidth='640' d:DesignHeight='480'> <Canvas x:Name="LayoutRoot" Background="Gray"> <MediaElement x:Name="MediaStretchFill" Canvas.Left="350" Canvas.Top="200" Width="300" Height="150" Source="/Assets/Butterfly.wmv" Stretch="Fill" /> </Canvas> </UserControl>