Change image on toolbar's button

Hi all, this is my problem:

I have a Toolbar named Toolbar1. This Toolbar is bound to an image list named ImageList1. ImageList1 has 2 images, one is name "Forward" and the other one named "Approve".

On Toolbar1 I have a button named "Approve". This button's image is bound to ImageList1's "Approve" image. How do I change the button's image to ImageList1's "Forward" image during run time.

Thanks in advance,
JDN

VB Code:

'assuming the key of the button is "Approve" and
    'the key of the image is "Forward"
    Toolbar1.Buttons("Approve").Image = "Forward"

Thanks Serge, it works perfectly.