<Page
  xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
  xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml">
  <DockPanel LastChildFill="True">
      <Slider Name="MyZoomSlider" Minimum=".5" Maximum="20" Value="1" DockPanel.Dock="Top" />
      <TextBlock Margin="5,5,0,5" DockPanel.Dock="Top" Text="{Binding ElementName=MyZoomSlider, Path=Value, StringFormat='Current Zoom: \{0:0.0\}%'}"/>
      <ScrollViewer VerticalScrollBarVisibility="Auto" HorizontalScrollBarVisibility="Auto">
          <Rectangle Fill="Blue" Height="100" Width="100" Margin="10" HorizontalAlignment="Left" VerticalAlignment="Top">
              <Rectangle.LayoutTransform>
                  <ScaleTransform