<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="120" Width="240"> <Window.Resources> <Style TargetType="{x:Type Button}"> <Setter Property="Margin" Value="4"/> <Setter Property="Width" Value="80"/> <Setter Property="Height" Value="24"/> <Setter Property="FontWeight" Value="Bold"/> </Style> </Window.Resources> <Grid Margin="20"> <StackPanel Orientation="Horizontal"> <Button>One</Button> <Button FontWeight="Thin">Two</Button> </StackPanel> </Grid> </Window>