A FontFamily ComboBox in WPF 4.5

I'm working on a little WPF 4.5 sample app. As part of that, I needed to create a drop-down list of Font Families.

The Data Source
I wanted control over the fonts including sorting and, potentially, filtering the results. I didn't want to use static binding from XAML. So, in my viewmodel, I added a collection of FontFamily objects which is loaded by a LoadSystemFonts function.

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