the minimum value of the scale (usually 0)
the maximum value of the scale (usually 100)
the stepping of value when a scroll-wheel event, or up/down arrow event occurs (usually 2)
a null-terminated array of icon names, or null if you want to set the list later with gtk.scale_button.ScaleButton.setIcons
Creates a gtk.scale_button.ScaleButton.
The new scale button has a range between min and max, with a stepping of step.