Redraw Picturebox at offset and back to simulate as a button effect - vb.net

Question

I have some images of document and book covers and those are displayed using pictureboxes in a Table layout panel.
Image excerpt from winform app
I am following this code
(From: https://social.msdn.microsoft.com/Forums/vstudio/en-US/da545e8e-e059-4681-9893-6d5dbdf6eba6/drop-shadow-around-the-image-in-picturebox?forum=vbgeneral)
to make picturebox work as a button when clicked and open the desired book or document.
Public Enum ShadowPosition As Integer
TopLeft = 0
TopRight = 1
BottomLeft = 2
BottomRight = 3
End Enum
Private Sub AddImageWithShadow(ByVal img As System.Drawing.Image, ByVal area As ShadowPosition, ByVal thickness As Integer, ByVal clr As Color, ByVal PicBox As PictureBox)
Using bm As New Bitmap(img.Width + thickness, img.Height + thickness)
Using gr As Graphics = Graphics.FromImage(bm)
Dim ix, iy As Integer
Dim rect As New Rectangle(thickness, thickness, img.Width, img.Height)
If area = ShadowPosition.TopLeft Or area = ShadowPosition.TopRight Then
iy = thickness
rect.Y = 0
End If
If area = ShadowPosition.TopLeft Or area = ShadowPosition.BottomLeft Then
ix = thickness
rect.X = 0
End If
gr.FillRectangle(New SolidBrush(clr), rect)
gr.DrawImage(img, ix, iy)
End Using
If PicBox.Image IsNot Nothing Then PicBox.Image.Dispose()
PicBox.Image = New Bitmap(bm)
End Using
End Sub
I tried to change the position of image:
Picturebox1.Location = New Point(10, 10)
Is there a way someone could guess to redarw picturebox at some offset without its drop shadow and back to initial state.