<StackPanel xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
xmlns:s="clr-namespace:System;assembly=mscorlib">
<StackPanel.Resources>
<s:Double x:Key="fontsizeLarge">18</s:Double>
<s:Double x:Key="fontsizeSmall">14</s:Double>
</StackPanel.Resources>
<Button HorizontalAlignment="Center"
VerticalAlignment="Center"
Margin="24">
<Button.FontSize>
<StaticResource ResourceKey="fontsizeLarge" />
</Button.FontSize>
Button with large FontSize
</Button>
<Button HorizontalAlignment="Center"
VerticalAlignment="Center"
Margin="24"
FontSize="{StaticResource fontsizeSmall}" >
Button with small FontSize
</Button>
</StackPanel>
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