<Window x:Class="BitmapEffects.Window4" xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" Title="Bitmap Effects" Height="538" Width="600" > <StackPanel> <Rectangle Height="50" Width="200" Fill="White" Stroke="Black"> <Rectangle.BitmapEffect> <DropShadowBitmapEffect ShadowDepth="{Binding Path=Value, ElementName=sliderDrop}" /> </Rectangle.BitmapEffect> </Rectangle> <Slider Minimum="0" Maximum="10" Name="sliderDrop" Value="14"/> <TextBox Text="{Binding ElementName=sliderDrop, Path=Value}"/> </StackPanel> </Window>