Display picturebox position during drag&drop

ex: I have a series of PictureBoxes (10 rows x 6 columns) internal to a panel, I do not use datagrdiview.

I have to understand when the PicureBox I drag arrives at row 6, to increase the VertScrollBar.Value, to display the next line

with MouseHover and MouseMove I can get to know the potion of each PictureBox, I have to 

during Drag&Drop does not trigger the MouseMove event.

There is no DragMove event

pictBox[i].MouseHover += new EventHandler(picHover_Click);
                pictBox[i].MouseLeave += new EventHandler(picLeave_Click);
                pictBox[i].MouseDown += picture_MouseDown;
                pictBox[i].MouseMove += picture_MouseMove;
                pictBox[i].AllowDrop = true;

private void picture_MouseMove(object sender, MouseEventArgs e)
        {
            lblMesg.Visible = true;
            lblMesg.Text = pnlCatalogo.VerticalScroll.Value.ToString() + " - " + ThumbActive.ToString();
        }