Loading bgl maked with gmax!

Hi guys!I' ve a big problem, i' ve build an ultralight planes airport with a gmax and i' ve exported bgl files.Now i have copied this bgl in fs9addon sceneryVallicella(name of the airport)scenery and in the same directory Vallicella i' ve put the textures.After this i' ve load the scenery from the scenery library in fs9 and it's all ok but after this the rwy don't appear in the rwys list.Can someone help me? Thanks!