<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> <Rectangle Grid.Row="1" RenderTransformOrigin="1,0.5"> <Rectangle.Fill> <VisualBrush Visual="{Binding ElementName=txt}"></VisualBrush> </Rectangle.Fill> <Rectangle.OpacityMask> <LinearGradientBrush StartPoint="0,0" EndPoint="0,1"> <GradientStop Offset="0.3" Color="Transparent"></GradientStop> <GradientStop Offset="1" Color="#44000000"></GradientStop> </LinearGradientBrush> </Rectangle.OpacityMask> <Rectangle.RenderTransform> <ScaleTransform ScaleY="-1"></ScaleTransform> </Rectangle.RenderTransform> </Rectangle> </Canvas> </Page>