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<Window x:Class="CrawlDataFromHowKteam.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:CrawlDataFromHowKteam"
        mc:Ignorable="d"
        Title="MainWindow" Height="350" Width="525">
    <Grid>
        <Grid.RowDefinitions>
            <RowDefinition Height="auto"></RowDefinition>
            <RowDefinition></RowDefinition>
        </Grid.RowDefinitions>
        <Grid.ColumnDefinitions>
            <ColumnDefinition Width="250"></ColumnDefinition>
            <ColumnDefinition></ColumnDefinition>
        </Grid.ColumnDefinitions>
        <Grid Grid.Column="0" Grid.Row="0">
            <Button>Load data</Button>
        </Grid>
        <Grid Grid.Column="1" Grid.Row="0">
            <Button Click="Button_Click">Add item into tree view</Button>
        </Grid>
        
        <TreeView x:Name="treeMain" Grid.Column="0" Grid.Row="1">
            <TreeView.ItemTemplate>
                <HierarchicalDataTemplate ItemsSource="{Binding Items}">
                    <StackPanel Orientation="Horizontal">
                        <TextBlock Text="{Binding Name}"></TextBlock>
                        <Button Content="{Binding URL}"></Button>
                    </StackPanel>
                </HierarchicalDataTemplate>
            </TreeView.ItemTemplate>
        </TreeView>
        <WebBrowser x:Name="wbMain" Grid.Column="1" Grid.Row="1"></WebBrowser>
    </Grid>
</Window>
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using System;
using System.Collections.Generic;
using System.Collections.ObjectModel;
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 CrawlDataFromHowKteam
{
    /// <summary>
    /// Interaction logic for MainWindow.xaml
    /// </summary>
    public partial class MainWindow : Window
    {
        ObservableCollection<MenuTreeItem> TreeItems;
        public MainWindow()
        {
            InitializeComponent();

             TreeItems = new ObservableCollection<MenuTreeItem>();
            MenuTreeItem item1 = new MenuTreeItem() { Name = "Item1", URL = "https://www.howkteam.com/Course/Lap-trinh-WPF-co-ban/TreeView-Binding-trong-Lap-trinh-WPF-1354",
                Items = new ObservableCollection<MenuTreeItem>()
                {
                    new MenuTreeItem() { Name = "sub item1", URL="sadsda"},
                    new MenuTreeItem() { Name = "sub item1", URL="sadsda"},
                    new MenuTreeItem() { Name = "sub item1", URL="sadsda"},
                    new MenuTreeItem() { Name = "sub item1", URL="sadsda"}
                }
            };
            MenuTreeItem item2 = new MenuTreeItem()
            {
                Name = "Item2",
                URL = "https://www.howkteam.com/Course/Lap-trinh-WPF-co-ban/TreeView-Binding-trong-Lap-trinh-WPF-1354",
                Items = new ObservableCollection<MenuTreeItem>()
                {
                    new MenuTreeItem() { Name = "sub item1", URL="sadsda"},
                    new MenuTreeItem() { Name = "sub item1", URL="sadsda"},
                    new MenuTreeItem() { Name = "sub item1", URL="sadsda"},
                    new MenuTreeItem() { Name = "sub item1", URL="sadsda"}
                }
            };

            AddItemIntoTreeViewItem(TreeItems, item1);
            AddItemIntoTreeViewItem(TreeItems, item2);

            treeMain.ItemsSource = TreeItems;
        }

        #region methods

        void AddItemIntoTreeViewItem(ObservableCollection<MenuTreeItem> root, MenuTreeItem node)
        {
            root.Add(node);
        }

        #endregion

        private void Button_Click(object sender, RoutedEventArgs e)
        {
            MenuTreeItem item3 = new MenuTreeItem()
            {
                Name = "Item3",
                URL = "https://www.howkteam.com/Course/Lap-trinh-WPF-co-ban/TreeView-Binding-trong-Lap-trinh-WPF-1354",
                Items = new ObservableCollection<MenuTreeItem>()
                {
                    new MenuTreeItem() { Name = "sub item1", URL="sadsda"},
                    new MenuTreeItem() { Name = "sub item1", URL="sadsda"},
                    new MenuTreeItem() { Name = "sub item1", URL="sadsda"},
                    new MenuTreeItem() { Name = "sub item1", URL="sadsda"}
                }
            };

            AddItemIntoTreeViewItem(TreeItems[0].Items, item3);
        }
    }
}
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using System;
using System.Collections.Generic;
using System.Collections.ObjectModel;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace CrawlDataFromHowKteam
{
    public class MenuTreeItem
    {
        public string Name { get; set; }
        public string URL { get; set; }
        public ObservableCollection<MenuTreeItem> Items { get; set; }
        public MenuTreeItem()
        {
            this.Items = new ObservableCollection<MenuTreeItem>();
        }
    }
}
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