change brush size with tablet?

How do i setup the wacom intous5 tablet so that when i “spin the wheel”, the brush size gets smaller or bigger. I can do this if i hover my cursor over the set brush size line, but not if, for example, if im drawing and i want to change the brush size without having to move the cursor to the Pen tab. I now u can do this in Photoshop, but how do i do this in toon boom studio 7.1?

Hi, There,
Unfortunately there’s no shortcut is associated to the brush size, only the Mouse wheel is interacting with the Slider.