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Sheriff is a Business Solutions Architect with Fairway Technologies, Inc. There are many examples of using the Windows Presentation Foundataion (WPF) Tree View that you can find on the Web, however, most of them only show you how to go to two levels. This is where it’s vital to understand exactly how the Hierarchical Data Templates work.
In this case, the Items Source uses the Employees property as the collection of Employee objects.Instead, you use XAML to create the instance of the Employee Types class as shown in line 12 of Figure 4.