How to add content to TabViewItem dynamically

• If you are using Microsoft.Toolkit.Uwp.UI.Controls.TabView use the following snippet TabView tabView = MyTabs; var tabFlower = new TabViewItem {Header = "Flower"};
  tabView.Items.Add(tabFlower); // Tab content
  var txtDetails = new TextBlock();
  txtDetails.Text = "Lorem Ipsum";
  tabFlower.Content = txtDetails;
• If you are using Microsoft.UI.Xaml.Controls.TabView use the following snippet TabView tabView = MyTabs; var tabFlower = new TabViewItem {Header = "Flower"};
  tabView.TabItems.Add(tabFlower); // Tab content
  var txtDetails = new TextBlock();
  txtDetails.Text = "Lorem Ipsum";
  tabFlower.Content = txtDetails;

Hi, try following demo with Microsoft.Toolkit.Uwp.UI.Controls.TabView:

<Page  
    x:Class="App1.Page05"  
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"  
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"  
    xmlns:local="using:App05"  
    xmlns:d="http://schemas.microsoft.com/expression/blend/2008"  
    xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"  
    xmlns:controls="using:Microsoft.Toolkit.Uwp.UI.Controls"  
    mc:Ignorable="d"  
    Background="{ThemeResource ApplicationPageBackgroundThemeBrush}">  
  <Page.DataContext>  
    <local:ViewModel/>  
  </Page.DataContext>  
  <Grid>  
    <controls:TabView ItemsSource="{Binding View}"/>  
  </Grid>  
</Page>  

----------------------------------------------------------

using Microsoft.Toolkit.Uwp.UI.Controls;  
using System;  
using System.Collections.ObjectModel;  
using System.Windows.Input;  
using Windows.UI.Xaml.Controls;  
  
namespace App05  
{  
  public class ViewModel  
  {  
    public ViewModel() => InsertNewTabItem();  
  
    public ObservableCollection<TabViewItem> View { get; } = new ObservableCollection<TabViewItem>();  
  
    private int index = 1;  
    private void InsertNewTabItem()  
    {  
      var ti = new TabViewItem() { Header = $"Tab {index++}" };  
      View.Add(ti);  
      // Tab content Panel  
      StackPanel stp = new StackPanel() { Height = 100 };  
      ti.Content = stp;  
      // panel text content  
      var txtDetails = new TextBlock();  
      txtDetails.Text = $"This is text in Tabitem '{ti.Header}'";  
      stp.Children.Add(txtDetails);  
      // panel button content  
      var btn = new Button() { Content = "Add new Tab" };  
      btn.Command = new RelayCommand((state) => InsertNewTabItem());  
      stp.Children.Add(btn);  
    }  
  }  
  
  public class RelayCommand : ICommand  
  {  
    private readonly Predicate<object> _canExecute;  
    private readonly Action<object> _execute;  
    public event EventHandler CanExecuteChanged;  
    public RelayCommand(Action<object> execute) : this(execute, null) { }  
    public RelayCommand(Action<object> execute, Predicate<object> canExecute) { _execute = execute; _canExecute = canExecute; }  
    public bool CanExecute(object parameter) => (_canExecute == null) ? true : _canExecute(parameter);  
    public void Execute(object parameter) => _execute(parameter);  
    public void RaiseCanExecuteChanged() => CanExecuteChanged?.Invoke(this, EventArgs.Empty);  
  }  
}