hide isocurves

I have a nifty little script to print a shaded viewport using grasshopper, but am struggling to figure out how to hide the isocurves and adjust the edge colors of my surfaces.  Obviously I could just use RhinoApp.Runscript(" _OptionsPage _H _Enter",true) to pull up the dialog and then adjust the isocurve width to 0 and the edge color to the desired color, but it would be really awesome to be able to do this directly.  Does anyone know how to do this?

Cheers,

Ben