<Window x:Class="WpfApplication1.Window1"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
Title="WPF" Height="300" Width="300">
<UniformGrid>
<UniformGrid.Resources>
<Style TargetType="{x:Type Rectangle}">
<Setter Property="Height" Value="50" />
<Setter Property="Width" Value="50" />
<Setter Property="Margin" Value="5" />
</Style>
</UniformGrid.Resources>
<Rectangle Fill="{x:Static SystemColors.ActiveBorderBrush}" />
</UniformGrid>
</Window>
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