How to get a tree node in mouse double click event in WPF TreeGrid (SfTreeGrid)?

App.config

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+<?xml version="1.0" encoding="utf-8" ?>
+<configuration>
+    <startup> 
+        <supportedRuntime version="v4.0" sku=".NETFramework,Version=v4.6" />
+    </startup>
+</configuration>

App.xaml

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+<Application x:Class="SfTreeGridDemo.App"
+             xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
+             xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
+             xmlns:local="clr-namespace:SfTreeGridDemo"
+             StartupUri="MainWindow.xaml">
+    <Application.Resources>
+    </Application.Resources>
+</Application>

App.xaml.cs

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+using System;
+using System.Collections.Generic;
+using System.Configuration;
+using System.Data;
+using System.Linq;
+using System.Threading.Tasks;
+using System.Windows;
+
+namespace SfTreeGridDemo
+{
+    /// <summary>
+    /// Interaction logic for App.xaml
+    /// </summary>
+    public partial class App : Application
+    {
+    }
+}

MainWindow.xaml

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+<Window x:Class="SfTreeGridDemo.MainWindow"
+        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
+        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
+        xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
+        xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
+        xmlns:local="clr-namespace:SfTreeGridDemo"
+         xmlns:syncfusion="http://schemas.syncfusion.com/wpf"
+        mc:Ignorable="d"
+        Title="MainWindow" Height="450" Width="1000">
+    <Window.DataContext>
+        <local:ViewModel />
+    </Window.DataContext>
+    <Grid>
+        <syncfusion:SfTreeGrid Name="treeGrid"
+                               AutoGenerateColumns="False"
+                               AllowEditing="True"
+                               ChildPropertyName="ReportsTo"
+                               ParentPropertyName="ID"
+                               ItemsSource="{Binding Employees}"
+                               SelfRelationRootValue="-1"
+                               AllowDraggingRows="True"
+                               AllowDrop="True">
+            <syncfusion:SfTreeGrid.Columns>
+                <syncfusion:TreeGridTextColumn MappingName="FirstName" HeaderText="First Name" />
+                <syncfusion:TreeGridTextColumn  MappingName="LastName"  HeaderText="Last Name" />
+                <syncfusion:TreeGridCheckBoxColumn MappingName="IsSelected"  HeaderText="Is Selected" />
+                <syncfusion:TreeGridTextColumn MappingName="ID"  HeaderText="ID" />
+                <syncfusion:TreeGridTextColumn  MappingName="Title"  HeaderText="Title"  />
+                <syncfusion:TreeGridCurrencyColumn  MappingName="Salary"  HeaderText="Salary" />
+                <syncfusion:TreeGridTextColumn  MappingName="ReportsTo"  HeaderText="Reports To"  />
+            </syncfusion:SfTreeGrid.Columns>
+        </syncfusion:SfTreeGrid>
+    </Grid>
+</Window>

MainWindow.xaml.cs

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+using Syncfusion.UI.Xaml.TreeGrid;
+using Syncfusion.UI.Xaml.TreeGrid.Helpers;
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+using System.Windows;
+using System.Windows.Controls;
+using System.Windows.Data;
+using System.Windows.Documents;
+using System.Windows.Input;
+using System.Windows.Media;
+using System.Windows.Media.Imaging;
+using System.Windows.Navigation;
+using System.Windows.Shapes;
+
+namespace SfTreeGridDemo
+{
+
+    /// <summary>
+    /// Interaction logic for MainWindow.xaml
+    /// </summary>
+    public partial class MainWindow : Window
+    {
+        public MainWindow()
+        {
+            InitializeComponent();
+            this.treeGrid.MouseDoubleClick += TreeGrid_MouseDoubleClick;
+        }
+
+        private void TreeGrid_MouseDoubleClick(object sender, MouseButtonEventArgs e)
+        {
+            var treeGridPanel = this.treeGrid.GetTreePanel();
+            // get the row and column index based on the pointer position 
+            var rowColumnIndex = treeGridPanel.PointToCellRowColumnIndex(e.GetPosition(treeGridPanel));
+            if (rowColumnIndex.IsEmpty)
+                return;
+            var treeNodeAtRowIndex = treeGrid.GetNodeAtRowIndex(rowColumnIndex.RowIndex);                       
+
+            MessageBox.Show("TreeNode : " + treeNodeAtRowIndex.ToString());
+        }
+    }
+}

Model.cs

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+using System;
+using System.Collections;
+using System.Collections.Generic;
+using System.ComponentModel;
+using System.ComponentModel.DataAnnotations;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace SfTreeGridDemo
+{
+    public class EmployeeInfo : IDataErrorInfo, INotifyDataErrorInfo
+    {
+        int _id;
+        string _firstName;
+        string _lastName;
+        private string _title;
+        decimal _salary;
+        int _reportsTo;
+        bool isSelected;
+        public event EventHandler<DataErrorsChangedEventArgs> ErrorsChanged;
+
+        public string FirstName
+        {
+            get { return _firstName; }
+            set { _firstName = value; }
+        }
+
+        public string LastName
+        {
+            get { return _lastName; }
+            set { _lastName = value; }
+        }
+
+        public bool IsSelected
+        {
+            get { return isSelected; }
+            set { isSelected = value; }
+        }
+
+        [Range(1, 2, ErrorMessage = "ID between 1 and 2 alone processed")]
+        public int ID
+        {
+            get { return _id; }
+            set { _id = value; }
+        }
+
+        public string Title
+        {
+            get { return _title; }
+            set { _title = value; }
+        }
+
+        public decimal Salary
+        {
+            get { return _salary; }
+            set { _salary = value; }
+        }
+
+        public int ReportsTo
+        {
+            get { return _reportsTo; }
+            set { _reportsTo = value; }
+        }
+
+        [Display(AutoGenerateField = false)]
+
+        public string Error => string.Empty;
+
+        public string this[string columnName]
+        {
+            get
+            {
+                if (!columnName.Equals("Salary"))
+                    return string.Empty;
+                if (this.Salary < 10000 || this.Salary > 30000)
+                    return "The 'Salary' field can range from 10000 to 30000 ";
+
+                return string.Empty;
+            }
+        }
+
+        [Display(AutoGenerateField = false)]
+
+        public bool HasErrors
+        {
+            get
+            {
+                return false;
+            }
+        }
+
+        private List<string> errors = new List<string>();
+        public IEnumerable GetErrors(string propertyName)
+        {
+            if (!propertyName.Equals("Title"))
+                return null;
+
+            if (this.Title.Contains("Management"))
+                errors.Add("Management is not valid ");
+
+            return errors;
+        }
+    }
+}

Properties/AssemblyInfo.cs

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+using System.Reflection;
+using System.Resources;
+using System.Runtime.CompilerServices;
+using System.Runtime.InteropServices;
+using System.Windows;
+
+// General Information about an assembly is controlled through the following
+// set of attributes. Change these attribute values to modify the information
+// associated with an assembly.
+[assembly: AssemblyTitle("SfTreeGrid_MVVM")]
+[assembly: AssemblyDescription("")]
+[assembly: AssemblyConfiguration("")]
+[assembly: AssemblyCompany("")]
+[assembly: AssemblyProduct("SfTreeGrid_MVVM")]
+[assembly: AssemblyCopyright("Copyright ©  2019")]
+[assembly: AssemblyTrademark("")]
+[assembly: AssemblyCulture("")]
+
+// Setting ComVisible to false makes the types in this assembly not visible
+// to COM components.  If you need to access a type in this assembly from
+// COM, set the ComVisible attribute to true on that type.
+[assembly: ComVisible(false)]
+
+//In order to begin building localizable applications, set
+//<UICulture>CultureYouAreCodingWith</UICulture> in your .csproj file
+//inside a <PropertyGroup>.  For example, if you are using US english
+//in your source files, set the <UICulture> to en-US.  Then uncomment
+//the NeutralResourceLanguage attribute below.  Update the "en-US" in
+//the line below to match the UICulture setting in the project file.
+
+//[assembly: NeutralResourcesLanguage("en-US", UltimateResourceFallbackLocation.Satellite)]
+
+
+[assembly: ThemeInfo(
+    ResourceDictionaryLocation.None, //where theme specific resource dictionaries are located
+                                     //(used if a resource is not found in the page,
+                                     // or application resource dictionaries)
+    ResourceDictionaryLocation.SourceAssembly //where the generic resource dictionary is located
+                                              //(used if a resource is not found in the page,
+                                              // app, or any theme specific resource dictionaries)
+)]
+
+
+// Version information for an assembly consists of the following four values:
+//
+//      Major Version
+//      Minor Version
+//      Build Number
+//      Revision
+//
+// You can specify all the values or you can default the Build and Revision Numbers
+// by using the '*' as shown below:
+// [assembly: AssemblyVersion("1.0.*")]
+[assembly: AssemblyVersion("1.0.0.0")]
+[assembly: AssemblyFileVersion("1.0.0.0")]