Vertical Marquee Toolbar Change Size

I would like to create a vertical toolbar with the caption appearing in marquee fashion (one letter at a time reading from top-to-bottom). I have tried simply creating a graphic (icon) in a drawing program and using that as the icon in a bevelbutton. That works but if the window is resized, the icon does not resize and the button looks silly.

I would either like to be able to create the bevelbutton (or something else… I’m easy) with the caption showing in marquee, or be able to adjust the size of the icon when the window is made larger.

Any suggestions?