<Rectangle Margin="0,0,0,0"> <Rectangle.Fill> <LinearGradientBrush StartPoint="0.5,0" EndPoint="0.5,1"> <GradientStop Color="DarkBlue" Offset="0.3" /> <GradientStop Color="SlateBlue" Offset="0.7" /> </LinearGradientBrush> </Rectangle.Fill> </Rectangle>
<Grid.Resources>
<Style x:Key="myRectangleStyle" TargetType="Rectangle">
<Setter Property="Margin" Value="0,0,0,0" />
<Setter Property="Fill">
<Setter.Value>
<LinearGradientBrush StartPoint="0.5,0" EndPoint="0.5,1">
<GradientStop Color="DarkBlue" Offset="0.3" />
<GradientStop Color="SlateBlue" Offset="0.7" />
</LinearGradientBrush>
</Setter.Value>
</Setter>
</Style>
</Grid.Resources>
<Rectangle Style="{StaticResource myRectangleStyle} />