Adding graphics to an image

[gianolif]

I am trying to plot squares on top of an image using the graphics.fillrectangle method. When the screen is minimised or a control becomes visible over the squares, they disappear. How can I make them stay there?

[divil]

You need to either paint your squares in the Paint event so they'll be painted whenever needed, or paint them on an offscreen bitmap and set the picturebox's Image property to that bitmap.