UWP. How to do some items in listbox bold in UWP.

public Form1()
    {
        InitializeComponent();

        ListBox1.Items.AddRange(new Object[] { "First Item", "Second Item"});
        ListBox1.DrawMode = DrawMode.OwnerDrawFixed;
    }

    private void ListBox1_DrawItem(object sender, DrawItemEventArgs e)
    {
        e.DrawBackground();
        e.Graphics.DrawString(ListBox1.Items[e.Index].ToString(), new Font("Arial", 10, FontStyle.Bold), Brushes.Black, e.Bounds);
        e.DrawFocusRectangle();
    }