Changing color of control's scrollbar

Hi!
I've a RichTextBox and a ListBox controls,
well, both have a scrollbar
These scrollbars have the "standard" colors, and
I need to change to other, like the scrollbars of
InternetExplorer (with Styles).

I think is very easy, with any SendMessage to
the control, but I don't know!

Any suggestion?

Thanks and regards.