reordering traces

I am sequentially creating and displaying a large number of traces of two general types. There are fewer of the second type, and when they occur they are interleaved with the first. An example graph is attached.

I would like to have both types of traces on the same graph, but avoid the present distracting Moire-like appearance by putting all the blue traces behind the red ones. To that end, I thought I could use the ReorderTraces operation within my function, but don't see how to combine the result of TraceNameList within the syntax of that operation, to put each blue trace at the bottom as it is added to the display. RayGraph.png