<Window x:Class="Styles.AutomaticStyles" xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" Title="AutomaticStyles" Height="300" Width="300" > <Window.Resources> <Style TargetType="Button"> <Setter Property="FontFamily" Value="Times New Roman" /> <Setter Property="FontSize" Value="18" /> <Setter Property="FontWeight" Value="Bold" /> </Style> </Window.Resources> <StackPanel Margin="5"> <Button Padding="5" Margin="5">Customized Button</Button> <Button Padding="5" Margin="5" Style="{x:Null}">A Normal Button</Button> <Button Padding="5" Margin="5">Another Customized Button</Button> </StackPanel> </Window>