I See Cool Stuff Today

    Just paste the following xaml into the XamlPad shipped with Microsoft Windows SDK or the XamlPad I create myself, you will get some unexpected surprise, really cool indeed:

<Viewbox xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
         xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
         Margin="10"
         OpacityMask="#99000000">
    <Button/>
</Viewbox>

    This is what I get in my own XamlPad: