The first row is for the 'header' (actually a Border ), and the second row is for the ItemsPresenter. Var item = tree. This problem occurs because WPFs default template for TreeViewItem is set up as a 3-column by 2-row Grid. (The xref: displays each item in the xref: the xref: enables scrolling within the control). Private void TreeView_SelectedItemChanged(object sender, Get TreeView reference and add both items. A simple TreeView example As we talked about in the previous article, the WPF TreeView can be used in a very simple manner, by adding TreeViewItem objects to it, either from Code-behind or simply by declaring them directly in your XAML. This topic introduces the TreeView and TreeViewItem controls, and provides simple examples of their use. Private void TreeView_Loaded(object sender, RoutedEventArgs e) / Interaction logic for MainWindow.xaml
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