Remove Surface.SetMaterial?

So in my code I use surface.SetMaterial and then draw a png. after than I then proceed to draw a shape with drawpoly but doing this draws the texture instead of a solid color. How do I reset it so surface.DrawPoly does not use the material?


[editline]3rd August 2016[/editline]

Looked for something like that but I was looking in the surface library, thanks!