Source: http://stackoverflow.com/questions/1136701/how-to-access-button-programatically-if-the-button-is-inside-using-c

private void listBox1_MouseLeftButtonUp(object sender, MouseButtonEventArgs e)
{
    //Get selected item
    ListBoxItem item = (ListBoxItem)listBox1.SelectedItem;
    string itemText = item.Content.ToString();
 
    //Check if item is already added
    foreach (TabItem tItem in tabControl1.Items)
    {
        if ((string)tItem.Tag == itemText)
        {
            //Item already added, just activate the tab
            tabControl1.SelectedItem = tItem;
            return;
        }
    }
 
    //Build new tab item
    TabItem tabItem = new TabItem();
    tabItem.Tag = itemText;
 
    //First build the Header content
    Label label = new Label();
    Button button = new Button();
    label.Content = itemText;
    button.Content = "X";
    button.Height = 20;
    button.Width = 20;
    button.FontWeight = FontWeights.Bold;
    button.Click += CloseTabButton_Click; //Attach the event click method
    button.Tag = tabItem; //Reference to the tab item to close in CloseTabButton_Click
    StackPanel panel = new StackPanel();
    panel.Orientation = Orientation.Horizontal;
    panel.Children.Add(label);
    panel.Children.Add(button);
    tabItem.Header = panel;
 
    //Then build the actual tab content
    //If you need only the ListView in here, you don't need a grid
    ListView listView = new ListView();
    //TODO: Populate the listView with what you need
    tabItem.Content = listView;
 
    //Add the finished tabItem to your TabControl
    tabControl1.Items.Add(tabItem);
    tabControl1.SelectedItem = tabItem; //Activate the tab
}
 
private void CloseTabButton_Click(object sender, RoutedEventArgs e)
{
    //The tab item was set to button.Tag when it was added
    Button button = (Button)sender;
    TabItem tabItem = (TabItem)button.Tag;
    if (tabItem != null)
    {
        button.Click -= CloseTabButton_Click; //Detach event handler to prevent memory leak
        tabControl1.Items.Remove(tabItem);
    }
}

var window = new Window();
var stackPanel = new StackPanel { Orientation = Orientation.Vertical };
stackPanel.Children.Add(new Label { Content = "Label" });
stackPanel.Children.Add(new Button { Content = "Button" });
window.Content = stackPanel;