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Create a Tree and add children

<Page xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"       xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"       HorizontalAlignment="Center" VerticalAlignment="Center"> <TreeView>   <TreeViewItem Header="A" IsExpanded="True">     <TreeViewItem Header="B" />     <TreeViewItem Header="C" IsExpanded="True">       <TreeViewItem Header="D" />       <TreeViewItem Header="E" />     </TreeViewItem>     <TreeViewItem Header="F" />   </TreeViewItem>   <TreeViewItem Header="G">     <TreeViewItem Header="Child a" />     <TreeViewItem Header="Child b" />     <TreeViewItem Header="Child c" />   </TreeViewItem> </TreeView> </Page>