<Page xmlns:treeView="using:Syncfusion.UI.Xaml.TreeView">
    
    <Page.DataContext>
        <local:FileViewModel />
    </Page.DataContext>
    
    <treeView:SfTreeView x:Name="treeView"
                          Width="400"
                          Height="500"
                          ChildPropertyName="SubFiles"
                          ItemsSource="{Binding Files}">
        <treeView:SfTreeView.ItemTemplate>
            <DataTemplate>
                <StackPanel Orientation="Horizontal">
                    <TextBlock Text="📁" Margin="0,0,5,0" />
                    <TextBlock Text="{Binding FileName}" 
                               VerticalAlignment="Center" />
                </StackPanel>
            </DataTemplate>
        </treeView:SfTreeView.ItemTemplate>
    </treeView:SfTreeView>
    
</Page>

public class FileViewModel : INotifyPropertyChanged
{
    public ObservableCollection<FileNode> Files { get; set; }
    
    public FileViewModel()
    {
        Files = new ObservableCollection<FileNode>
        {
            new FileNode 
            { 
                FileName = "Documents",
                SubFiles = new ObservableCollection<FileNode>
                {
                    new FileNode { FileName = "Resume.docx" },
                    new FileNode { FileName = "CoverLetter.pdf" }
                }
            },
            new FileNode 
            { 
                FileName = "Downloads",
                SubFiles = new ObservableCollection<FileNode>()
            }
        };
    }
    
    public event PropertyChangedEventHandler PropertyChanged;
}

public class FileNode : INotifyPropertyChanged
{
    private string _fileName;
    private ObservableCollection<FileNode> _subFiles;
    
    public string FileName
    {
        get => _fileName;
        set { _fileName = value; OnPropertyChanged(); }
    }
    
    public ObservableCollection<FileNode> SubFiles
    {
        get => _subFiles;
        set { _subFiles = value; OnPropertyChanged(); }
    }
    
    public event PropertyChangedEventHandler PropertyChanged;
    
    protected void OnPropertyChanged([CallerMemberName] string name = null)
    {
        PropertyChanged?.Invoke(this, new PropertyChangedEventArgs(name));
    }
}

<treeView:SfTreeView ItemsSource="{Binding Items}"
                      ChildPropertyName="Children">
    <treeView:SfTreeView.ItemTemplate>
        <DataTemplate>
            <StackPanel Orientation="Horizontal">
                <FontIcon Glyph="{Binding Icon}" 
                          FontSize="16" 
                          Margin="0,0,8,0" />
                <TextBlock Text="{Binding Name}" />
            </StackPanel>
        </DataTemplate>
    </treeView:SfTreeView.ItemTemplate>
</treeView:SfTreeView>

<treeView:SfTreeView SelectionMode="Multiple"
                      CheckBoxMode="Recursive">
    <!-- When parent checked, all children auto-check -->
</treeView:SfTreeView>

<treeView:SfTreeView LoadOnDemand="True"
                      LoadOnDemandCommand="{Binding LoadChildrenCommand}">
    <!-- Children load only when node expands -->
</treeView:SfTreeView>

// Single selection
treeView.SelectedItem = viewModel.RootNode.Children[0];

// Multiple selection
treeView.SelectedItems.Add(node1);
treeView.SelectedItems.Add(node2);

// Select all nodes
treeView.SelectAll();

<treeView:SfTreeView ItemHolding="OnItemHolding">
    <!-- Show context menu on right-click/long-press -->
</treeView:SfTreeView>

private void OnItemHolding(object sender, ItemHoldingEventArgs e)
{
    var flyout = new MenuFlyout();
    flyout.Items.Add(new MenuFlyoutItem { Text = "Rename" });
    flyout.Items.Add(new MenuFlyoutItem { Text = "Delete" });
    flyout.ShowAt(e.Element);
}