Put Button and TextBlock to Canvas
<UserControl x:Class='SilverlightApplication3.MainPage'
xmlns='http://schemas.microsoft.com/winfx/2006/xaml/presentation'
xmlns:x='http://schemas.microsoft.com/winfx/2006/xaml'
xmlns:d='http://schemas.microsoft.com/expression/blend/2008'
xmlns:mc='http://schemas.openxmlformats.org/markup-compatibility/2006'
mc:Ignorable='d'
d:DesignWidth='640'
d:DesignHeight='480'>
<Canvas x:Name="LayoutRoot" Background="White">
<Button Canvas.Left="10" Canvas.Top="20" Content="Button at (10,20)"/>
<TextBlock Text="Outer Canvas" Canvas.Left="180" Canvas.Top="10" FontSize="26"/>
<Canvas Canvas.Top="60" Canvas.Left="10" Background="LightSkyBlue" Width="200" Height="100">
<TextBlock Text="Nested Canvas" Canvas.Left="10" Canvas.Top="20"/>
</Canvas>
</Canvas>
</UserControl>
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