I have taken the project from the previous post and extended the effect class to support an Inner Glow.

The basic difference between the composition of the Inner Glow and the previous effects is that the gradients are reversed and the z index is changed to bring the gradient grid to the foreground. 

The Inner Glow uses as Clip mask to conform the glow to the Content shape as shown below.

Rect

This effect could use some refinement. Ideally this effect control would support effects such as Inner Glow and Drop Shadow simultaneously.