wire mesh mode

i set the wire in F5 to get rendered wiremesh
ok i want to see in the render a wiremesh of a certain mesh
but this one is totaly transparent ?

i can do it with other objects but not this one ?

can someone help

Thansk

this object has several material

and this means that you have to set each material to wire mesh mode
to get the final resutls as desired !

Thanks