WPF, using XPath in XAML with XmlDataProvider to select nodes based on selected value in ComboBox?

After Googling around for examples of XPath expressions in WPF, I found this article that gave me my solution in a round-about way. His example was more complicated than mine, so I didn't have to go creating XML converter classes. I just needed the following XAML for my dependent Component ComboBox.

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