windows phone textblock C#设置颜色以及换行

C#:
{
TextBlock A = new TextBlock();
A.Text = "111";
A.Foreground = new SolidColorBrush(Color.FromArgb(255, 255, 0, 0));
Txt.Children.Add(A);
A = null;
TextBlock B = new TextBlock();
B.Text = "222";
B.Foreground = new SolidColorBrush(Color.FromArgb(255, 0, 255, 0));
Txt.Children.Add(B);
B = null;
TextBlock C = new TextBlock();
C.Text = "333";
C.Foreground = new SolidColorBrush(Color.FromArgb(255, 0, 0, 255));
Txt.Children.Add(C);
C = null;
}

需要换行加：A.TextWrapping=TextWrapping.Wrap