The Dink Network

I never got to the point of asking about this, but it's really starting to piss me off now, so I'm gonna ask.

What button must you press in WinDinkEdit Plus to show the road tiles. The last tiles I've got up are the "cave" tiles. But when I look in original Dink's "tiles" folder, I can see that road tiles are number 41.

So what button must I press to see the road tiles?

Thanks