C# How to deleting image inside autogenerated picturebox?

Hi there. :)

I want to deleting image inside picturebox ( its autogenerated) that selected by mouse click event, So I can delete it with delete key or maybe contextmenu...

GENERATE PICTUREBOX:

private void SHOWIMAGETHUMBNAIL_Click(object sender, EventArgs e)
    {
 string theimage = AppDomain.CurrentDomain.BaseDirectory + @"allimages";
 string[] images = Directory.GetFiles(theimage, "*.png");
                int aa;
                for (aa = 1; aa < images.Count(); aa++)
                {
                    PictureBox myPicBox = new PictureBox();
                    myPicBox.Location = new Point(7, 240);
                    myPicBox.Width = 100;
                    myPicBox.Height = 77;
                    myPicBox.SizeMode = System.Windows.Forms.PictureBoxSizeMode.Zoom;
                    myPicBox.Margin = new Padding(3, 3, 3, 3);
                    myPicBox.Visible = true;
                    myPicBox.Image = new Bitmap(images[aa]);
                    this.flowLayoutPanel1.Controls.Add(myPicBox);
                    //myPicBox.Click += new EventHandler(curPb_Click);
                    //myPicBox.MouseUp += new MouseEventHandler(myPicBox_MouseUp);
                    myPicBox.MouseDown += new MouseEventHandler(myPicBox_MouseDown);
                    myPicBox.MouseLeave += new EventHandler(mmm_Leave);
                }


    }

CATCHING EVENT: ( I stuck in here )

        //private PictureBox senderAsPictureBox = null;
        private void mmm_Leave(object sender, EventArgs e)
        {
            PictureBox senderAsPictureBox = sender as PictureBox;
            senderAsPictureBox.BackColor = Color.Empty;
        }
        private void myPicBox_MouseDown(object sender, MouseEventArgs e)
        {
            PictureBox senderAsPictureBox = sender as PictureBox;
            MessageBox.Show(senderAsPictureBox.ToString());
            senderAsPictureBox.BackColor = Color.AliceBlue;
        }