NSBrowser and NSMatrix

I'm trying to implement an NSBrowser control and I set the delegate to a java object that has access tot he data. I'm having problems implementing the whole thing though. The docs on NSMAtrix dont really go about how to populate the matrix, and I tried to update the matrix on one of the first first calls to the delegate using InsertColumnWithCells and similar method but nothing works. I'm just trying to do something to how the multicolumn file browser works, any hint to better docs or examples would be appreciated.

thanks