A Partially Transparent Button
<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>
<Button Background="Purple" FontSize="14" FontWeight="Bold">
<Button.OpacityMask>
<LinearGradientBrush StartPoint="0,0" EndPoint="1,0">
<GradientStop Offset="0" Color="Black"></GradientStop>
<GradientStop Offset="1" Color="Transparent"></GradientStop>
</LinearGradientBrush>
</Button.OpacityMask>
<Button.Content>A Partially Transparent Button</Button.Content>
</Button>
</Canvas>
</UserControl>
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