Use BackGroundWorker to move pictureBox

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VB

multi-threading

picturebox

hey guys,
i'm developing a program in vb.net. i have a datagrid in my form. once the datagrid
is over 15 rows, i want to activate a picturebox to pb.visible = true (the picture is an arrow faces down) and change the pb.top up and down by 50 points, that way it will look like its going up and down. i use thread.sleep and it cause some issues because the form want response during the sleep (dahhhhh). anyway, i read the backgroundworker is able to solve this. i need the backgroundworker to work at the background during the whole time the pictureBox is set to visible = true. the problem is i new to the subject of multyThreading and i didnt manage to make it threw. any code will be good....
thanks a lot,
oron.