The effects of the Padding property on a TextBlock
<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 x:Name="LayoutRoot" Background="White"> <StackPanel x:Name="myStackPanel" Background="LightGray"> <TextBlock Text="this is a test" /> <TextBlock Text="thsi is a test" Padding="20.2" /> </StackPanel> </Grid> </UserControl>