Я динамически нарисовал доминошки

        private void Form1_Load(object sender, EventArgs e)
        {
            int a = 400;
            for (int i = 0; i < 7; i++)
            {
                PictureBox pictureBox = new PictureBox();
                pictureBox.Parent = this;

                pictureBox.BackgroundImage = global::WindowsApplication1.Properties.Resources.n;
                pictureBox.Left = a;
                pictureBox.Top = 30;

                pictureBox.Width = pictureBox3.Width;
                pictureBox.Height = pictureBox3.Height;

                pictureBox.Show();
                a += 54;
            }
            a = 400;
            for (int i = 0; i < 7; i++)
            {
                PictureBox pictureBox = new PictureBox();
                pictureBox.Parent = this;

                pictureBox.BackgroundImage = global::WindowsApplication1.Properties.Resources.n;
                pictureBox.Left = a;
                pictureBox.Top = 630;

                pictureBox.Width = pictureBox3.Width;
                pictureBox.Height = pictureBox3.Height;

                pictureBox.Show();
                a += 54;
            }
        }

А потом мне надо (после нажатия кнопки надо чтоб они пропали). Как это сделать?

        private void button1_Click(object sender, EventArgs e)
        {
            button2.Hide();
            button1.Hide();
            button3.Show();
        }