vmd does not open with filename in the command line argument in Mac OS X

I have recently shifted from Linux to Mac OS. I have installed vmd in this new machine. The vmd just load without any molecule when I type the following:

vmd protein.gro

This *.gro file contains a protein molecule. I want to open this file like in Linux:

*applicationname filename*

But it doensnt work. Launching the molecule via vmd just simply doesnt work. I have tried to google this problem but I couldnt find the right answer. Is there anybody who had the same problem and was able to tackle it ?