<Canvas x:Name="parentCanvas"
        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
        Loaded="jsLoaded"
        Width="640"
        Height="200"
        Background="Gray" >
  <Canvas x:Name="greenCanvas"
          Background="Green"
          Width="100"
          Height="100"
          Canvas.Left="50"
          Canvas.Top="50"/>
  <Canvas x:Name="redCanvas"
          Background="Red"
          Width="100"
          Height="100"
          Canvas.Left="75"
          Canvas.Top="75"/>
</Canvas>
