<Window x:Class="WpfApplication1.Window1"
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
    Title="Window1" Height="300" Width="300">
	<Grid>
		<Grid.RowDefinitions>
			<RowDefinition Height="Auto" />
			<RowDefinition Height="*" />
		</Grid.RowDefinitions>
		<Slider x:Name="zoom" Minimum="0.5" Maximum="5" SmallChange="0.1"/>
		<Canvas x:Name="zoomed" Grid.Row="1" >
			<Canvas.RenderTransform>
				<ScaleTransform ScaleX="{Binding ElementName=zoom, Path=Value}" 
						ScaleY="{Binding ElementName=zoom, Path=Value}"/>
			</Canvas.RenderTransform>
				<Ellipse Canvas.Left="150" Canvas.Top="50"
					 Fill="#FFCD6161" Stroke="Black" Width="28" Height="28"
					 RenderTransform="{Binding ElementName=zoomed, Path=RenderTransform.Inverse}"/>
				<TextBlock Canvas.Left="50" Canvas.Top="150"
					   Text="Cool" TextWrapping="Wrap" Foreground="Black"
					   RenderTransform="{Binding ElementName=zoomed, Path=RenderTransform.Inverse}"/>
		</Canvas>
	</Grid>
</Window>