Objects disappearing behind transparent fence

Hi!Is there a solution to eliminate the problem of objects disappearing behind a transparency when it is not fully transparent? I have designed a fence in gmax using a plane, with the opacity level not set to fully transparent, in order to reduce shimmer. But unfortunately, when buildings and aircraft are viewed through the fence, they simply disappear.I have also noticed in other sceneries that other people have used this system, or something similar, and it works. I have tried with all file formats (dxt1 dxt3 and normal bmp) but the objects only become visible when the fence transparency is set to 0, i.e. fully transparent.Any suggestions, please?Thanks,Daniel