A Really Blurred Button by setting the Radius of BlurBitmapEffect
<Page xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" x:Class="Microsoft.Samples.Graphics.RectangleExample" WindowTitle="Example"> <Canvas> <Button> <Button.Content>A Really Blurred Button</Button.Content> <Button.BitmapEffect> <BlurBitmapEffect Radius="5"></BlurBitmapEffect> </Button.BitmapEffect> </Button> </Canvas> </Page>