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//Note: you can use most elements for this, I used a button as an example
<Button>
<Button.Background>
<LinearGradientBrush StartPoint="0,0" EndPoint="1,1">
<GradientStop Color="Blue" Offset="0.2"/>
<GradientStop Color="White" Offset="0.5"/>
<GradientStop Color="Blue" Offset="1"/>
</LinearGradientBrush>
<Button.Background>
</Button>