I had someone ask me if there was a way to use the Layer Transparency on a Surface. The answer to that is no, but we have another way that works just as well. By using the LAYLOCKFADECTL variable, we can achieve the same thing.
Remember, that the Surface has the Contour Layers (in the Style), but also the parent Layer, for which, the Surface Object calls home. This parent Layer is the one that you will want to lock. Once locked, you will see that the Surface fades back to the degree you have set.
Here are the values for this variable:
0 Locked layers are not faded
>0 When the value is positive, controls the percent of fading up to 90 percent
<0 When the value is negative, locked layers are not faded, but the value is saved for switching to that value by changing the sign
Notice the difference: