Without Panel.ZIndex
<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'>
<Grid>
<Button Width="75" Height="23" Margin="0,0" HorizontalAlignment="Left" VerticalAlignment="Top">
One
</Button>
<Button Width="75" Height="23" Margin="15,15" HorizontalAlignment="Left" VerticalAlignment="Top">
Two
</Button>
<Button Width="75" Height="23" Margin="30,30" HorizontalAlignment="Left" VerticalAlignment="Top">
Three
</Button>
</Grid>
</UserControl>
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