How to Add more than two TextBlock object in ListBoxItem

ListBox_Add_Two_Textblock.cs

ListBoxItem lb = new ListBoxItem();
DockPanel dp = new DockPanel();
TextBlock user = new TextBlock();
user.Text = data.name;
if(data.color != null)
{
    user.Foreground = (SolidColorBrush)(new BrushConverter().ConvertFrom("#" + data.color));
}
TextBlock tb = new TextBlock();
tb.TextWrapping = TextWrapping.Wrap;
tb.Text = message;
if (bnetChattingColor == BnetChattingColor.Error || bnetChattingColor == BnetChattingColor.Info || bnetChattingColor == BnetChattingColor.Whisper)
{
    TextBlock status = new TextBlock();
    Thickness statusMargin = status.Margin;
    statusMargin.Right = 6;
    status.Margin = statusMargin;
    if (bnetChattingColor == BnetChattingColor.Error)
    {
        status.Text = "[에러]";
    }
    else if (bnetChattingColor == BnetChattingColor.Info)
    {
        status.Text = "[정보]";
    }
    else if (bnetChattingColor == BnetChattingColor.Whisper)
    {
        status.Text = "[귓속말]";
        Thickness userMargin = user.Margin;
        userMargin.Right = 6;
        user.Margin = userMargin;
        user.Text += ":";
    }
    dp.Children.Add(status);
} else
{
    Thickness userMargin = user.Margin;
    userMargin.Right = 6;
    user.Margin = userMargin;
    user.Text += ":";
}
dp.Children.Add(user);
dp.Children.Add(tb);
lb.Content = dp;