WPF

<Window x:Class="AddTabItem.Window1"
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
    Title="Window1" Height="300" Width="300">
    <Grid>
     <Grid.RowDefinitions>
         <RowDefinition Height="*" />
         <RowDefinition Height="25" />
     </Grid.RowDefinitions>
     <TabControl x:Name="TabControl1" 
                 VerticalAlignment="Stretch" HorizontalAlignment="Stretch"
                 Grid.Column="0" Grid.Row="0" Grid.RowSpan="1" />
        <Button x:Name="btnAddTab" Content="Add Tab" Click="btnAddTab_Click"
                Grid.Row="1" Grid.RowSpan="1"/>
     </Grid>
</Window>

namespace AddTabItem
{
    /// <summary>
    /// Interaction logic for Window1.xaml
    /// </summary>
    public partial class Window1 : Window
    {
        public Window1()
        {
            InitializeComponent();
        }

        private void btnAddTab_Click(object sender, RoutedEventArgs e)
        {
            AddTabs();
        }

        private void AddTabs()
        {
            TabItem tabitem = new TabItem();
            Button button = new Button();
            button.Content = "Added Button!";
            tabitem.Content = button;
            TabControl1.Items.Add(tabitem);
            TabControl1.SelectedIndex = TabControl1.Items.Count;
        }
    }
}

<Window x:Class="KeyViewListView.Window1"
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
    Title="Window1" Height="300" Width="300">
    <StackPanel>
        <ListView x:Name="MyList" HorizontalAlignment="Left" >
            <ListView.ItemTemplate>
                <DataTemplate>
                    <StackPanel Orientation="Horizontal">
                        <TextBlock Text="{Binding Path=Name}" Width="200" />
                        <TextBlock Text="{Binding Path=Age}" />
                    </StackPanel>
                </DataTemplate>
            </ListView.ItemTemplate>
        </ListView>
    </StackPanel>

</Window>