<Window x:Class="Styles.ReuseFontWithResources" xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" Title="ReuseFontWithResources" Height="368" Width="378" xmlns:s="clr-namespace:System;assembly=mscorlib" > <Window.Resources> <FontFamily x:Key="ButtonFontFamily">Times New Roman</FontFamily> <s:Double x:Key="ButtonFontSize">18</s:Double> <FontWeight x:Key="ButtonFontWeight">Bold</FontWeight> </Window.Resources> <StackPanel Margin="5"> <Button Padding="5" Margin="5" FontFamily="{StaticResource ButtonFontFamily}" FontWeight="{StaticResource ButtonFontWeight}" FontSize="{StaticResource ButtonFontSize}" >A Customized Button</Button> </StackPanel> </Window>