Wpf custom control template - relative font size

I am creating a custom WPF control that let's say for simplicity sake has a vertical stack panel with a "title" TextBlock, followed by a ContentPresenter. I want the font size for the "title" to be 5 Points LARGER than the size used in the content, which is inherited by whatever container the user places this control in.

How can I specify a font size in the control template for the header element using a relative value without exposing a property like "TitleFontSize" to the user? I want do "add 5".

I tried using a ScaleTransform on the header text block with mixed results (the text block scaled fine but the orientation was modified - I had the text right-justified and it moved "off the control" area when scaled). Also, I am not sure if scale transform would be approprite here.


A more generic way

Value converter

public class MathConverter : IValueConverter
    public object Convert( object value, Type targetType, object parameter, CultureInfo culture )
        return (double)value + double.Parse( parameter.ToString() );

    public object ConvertBack( object value, Type targetType, object parameter, CultureInfo culture )
        return null;

Converter Resource

<my:MathConverter x:Key="MathConverter" />


<TextBlock FontSize="{Binding
                     RelativeSource={RelativeSource AncestorType={x:Type Window}},
                     Converter={StaticResource MathConverter},
                     ConverterParameter=2}" />

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