Changing number of columns in NSTableview using GORM

[Vikram Vyas]

Hello,

I am trying to follow the AddressBook tutorial, originally meant for 
Cocoa on Macintosh OS-X, on GNUstep via GORM. I need to add four 
columns in NSTableview, while GORM by default provides table with only 
two columns. How can I change it to four. In case I cannot change it 
using GORM, then could you please tell me how should I change number of 
columns in my code.

Thanks,
Vikram