Delegate example

I have a subclass of NSTableView called CardTable and a subclass of NSDocument called MyDocument.

I would like CardTable to have a delegate function called rowHighlightColor which accepts the row index as a parameter and returns a NSColor.

I would like to make MyDocument the delegate of CardTable and have it implement rowHighlightColor.

Now, I via Interface Builder, I have already made MyDocument a delegate of CardTable and I know this works because MyDocument implements objectValueForTableColumn and it is getting called and is working.

This should be straightforward, but I am having trouble getting my custom rowHighlightColor delegate function setup. I was able to find an example at

http://en.wikipedia.org/wiki/Delegation_pattern

which I hoped was a complete example, but it does not appear to be.

What I did, based on this example was:

@interface CardTable : NSTableView {

}

@end

@interface CCardTableDelegate (NSObject)

-(NSColor*)cardTable:(CardTable*)cardTable rowHighlightColor:(int)row;

@end

But, I am getting the error:

error: cannot find interface declaration for 'CCardTableDelegate'

which makes sense, but I am uncertain what to do about it.

Any thoughts or comments would be appreciated. A pointer to a complete example would be greatly appreciated.

Thank you.