<Window x:Class="TreeGridSample.MainWindow"
        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
        xmlns:syncfusion="http://schemas.syncfusion.com/wpf">
    
    <syncfusion:SfTreeGrid Name="treeGrid"
                           AutoGenerateColumns="True"
                           ChildPropertyName="Children"
                           ItemsSource="{Binding Employees}"
                           AllowSorting="True"
                           AllowFiltering="True"
                           AllowEditing="True">
    </syncfusion:SfTreeGrid>
</Window>

using Syncfusion.UI.Xaml.TreeGrid;
using System.Collections.ObjectModel;

namespace TreeGridSample
{
    public class Employee
    {
        public int EmployeeID { get; set; }
        public string FirstName { get; set; }
        public string LastName { get; set; }
        public string Title { get; set; }
        public int ReportsTo { get; set; }
        public ObservableCollection<Employee> Children { get; set; }
        
        public Employee()
        {
            Children = new ObservableCollection<Employee>();
        }
    }

    public class EmployeeViewModel
    {
        public ObservableCollection<Employee> Employees { get; set; }
        
        public EmployeeViewModel()
        {
            Employees = new ObservableCollection<Employee>();
            PopulateData();
        }
        
        private void PopulateData()
        {
            var ceo = new Employee
            {
                EmployeeID = 1,
                FirstName = "Robert",
                LastName = "King",
                Title = "CEO"
            };
            
            ceo.Children.Add(new Employee
            {
                EmployeeID = 2,
                FirstName = "David",
                LastName = "Smith",
                Title = "VP of Sales",
                ReportsTo = 1
            });
            
            ceo.Children.Add(new Employee
            {
                EmployeeID = 3,
                FirstName = "Nancy",
                LastName = "Davolio",
                Title = "VP of Marketing",
                ReportsTo = 1
            });
            
            Employees.Add(ceo);
        }
    }
}

public class Task
{
    public int TaskID { get; set; }
    public string TaskName { get; set; }
    public int? ParentID { get; set; }  // Nullable for root items
}

// ViewModel
public ObservableCollection<Task> Tasks { get; set; }

<syncfusion:SfTreeGrid Name="treeGrid"
                       ItemsSource="{Binding Tasks}"
                       ParentPropertyName="ParentID"
                       SelfRelationRootValue="-1"
                       ChildPropertyName="TaskID">
</syncfusion:SfTreeGrid>

public class Folder
{
    public string FolderName { get; set; }
    public ObservableCollection<Folder> SubFolders { get; set; }
}

<syncfusion:SfTreeGrid Name="treeGrid"
                       ItemsSource="{Binding Folders}"
                       ChildPropertyName="SubFolders">
</syncfusion:SfTreeGrid>

treeGrid.RequestTreeItems += TreeGrid_RequestTreeItems;

private void TreeGrid_RequestTreeItems(object sender, TreeGridRequestTreeItemsEventArgs e)
{
    if (e.ParentItem == null)
    {
        // Load root nodes
        e.ChildItems = GetRootNodes();
    }
    else
    {
        // Load child nodes for expanded parent
        var parent = e.ParentItem as BusinessObject;
        e.ChildItems = GetChildNodes(parent.ID);
    }
}

<syncfusion:SfTreeGrid ItemsSource="{Binding Employees}"
                       AutoGenerateColumns="False">
    <syncfusion:SfTreeGrid.Columns>
        <syncfusion:TreeGridTextColumn HeaderText="Name" 
                                       MappingName="FirstName"
                                       Width="150"/>
        <syncfusion:TreeGridNumericColumn HeaderText="Age" 
                                          MappingName="Age"
                                          NumberDecimalDigits="0"/>
        <syncfusion:TreeGridDateTimeColumn HeaderText="DOB" 
                                           MappingName="DateOfBirth"
                                           FormatString="MM/dd/yyyy"/>
        <syncfusion:TreeGridCheckBoxColumn HeaderText="Active" 
                                           MappingName="IsActive"/>
    </syncfusion:SfTreeGrid.Columns>
</syncfusion:SfTreeGrid>

<syncfusion:SfTreeGrid ItemsSource="{Binding Employees}"
                       ChildPropertyName="Children">
    <syncfusion:SfTreeGrid.RecordContextMenu>
        <ContextMenu>
            <MenuItem Header="Add Child" 
                      Command="{Binding AddChildCommand}"
                      CommandParameter="{Binding}"/>
            <MenuItem Header="Delete" 
                      Command="{Binding DeleteCommand}"
                      CommandParameter="{Binding}"/>
        </ContextMenu>
    </syncfusion:SfTreeGrid.RecordContextMenu>
</syncfusion:SfTreeGrid>

public class EmployeeViewModel : INotifyPropertyChanged
{
    public ICommand AddChildCommand { get; set; }
    public ICommand DeleteCommand { get; set; }
    
    public EmployeeViewModel()
    {
        AddChildCommand = new RelayCommand(AddChild);
        DeleteCommand = new RelayCommand(Delete);
    }
    
    private void AddChild(object parameter)
    {
        var parent = parameter as Employee;
        if (parent != null)
        {
            parent.Children.Add(new Employee { /* ... */ });
        }
    }
}