The Color Themes panel in Illustrator does not have a scroll bar. I am using a Wacom tablet, but the Color Themes panel does not scroll even when I have assigned the function "scroll" to its scroll bar. I can scroll in other applications, both Adobe and others, so it doesn't seem like the fault of the tablet or tablet driver. The fact that there is no scroll bar in the default UI so it can be used with any input device is a glaring oversight. The panel is nearly useless without one.