convert splines to ploy, then you won't see any thing...why?

as you see at this pic, I create this line and then convert it to poly, but then the only way to see it, is by vertex mode and there is no line anymore..

I want to create line at poly/mesh mode, how can I do that? :shock:

Dude... Do you know, what does it mean POLY... polygon. As rule 1 poly with 4 connected edges - its 2 sub-poly.
Connect those vertex by edge... And happness`ll be with you.