John: What about adding a Fill Opacity/Stroke Opacity slider under the color controls, perhaps separated by a horizontal line to make it clear that alpha only controls the color's transparency. It would work well with the spinscale widget since you could fully write it out the name for the new slider.
John: What about adding a Fill Opacity/Stroke Opacity slider under the color controls, perhaps separated by a horizontal line to make it clear that alpha only controls the color's transparency. It would work well with the spinscale widget since you could fully write it out the name for the new slider.