Reference SystemColors
<StackPanel xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" Orientation="Horizontal"> <StackPanel> <StackPanel.Resources> <SolidColorBrush x:Key="{x:Static SystemColors.ActiveCaptionBrushKey}" Color="Red" /> </StackPanel.Resources> <Button HorizontalAlignment="Center" VerticalAlignment="Center" Margin="24" Foreground="{DynamicResource {x:Static SystemColors.ActiveCaptionBrushKey}}"> Button with Red text </Button> </StackPanel> <StackPanel> <Button HorizontalAlignment="Center" VerticalAlignment="Center" Margin="24" Foreground="{DynamicResource {x:Static SystemColors.ActiveCaptionBrushKey}}"> Button with Blue text </Button> </StackPanel> </StackPanel>