A basic Grid using star sizing.
<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"> <Grid x:Name="myGrid" ShowGridLines="True" Background="LightGray" Width="200" Height="200"> <Grid.RowDefinitions> <RowDefinition Height="50"></RowDefinition> <RowDefinition Height="2*"></RowDefinition> <RowDefinition Height="3*"></RowDefinition> </Grid.RowDefinitions> <Grid.ColumnDefinitions> <ColumnDefinition Width="50"></ColumnDefinition> <ColumnDefinition Width="2*"></ColumnDefinition> <ColumnDefinition Width="3*"></ColumnDefinition> </Grid.ColumnDefinitions> </Grid> </Grid> </UserControl>