Here is another for V8i to Activate a Reference file by Data point

I added a Reference Activate and Reference Deactivate on my View bar menu

1st create a dglib file in your interface folder .

Then open the file Key in MDL load custmiz

Go to the 2d view control menu and insert a tool(s)

 For the command keyin" t,reference activate;%d "

The %d allows you to pick the Reference file you want to activate by data point

You can do the same for deactivate reference

Of course you could also put this on a function key