How to initialise an array class inheriting from NSArray?

[Christopher Culver]

I've got a class that inherits from NSArray, but don't know how to 
initialise it. Here's how it looks:

@implementation NewClass : NSArray.

[...]

- (id) init
{
       self  = [super arrayWithObjects: @"String1", @"String2", nil];
       return self;
}

However, when I compile this, gcc reports that "NSArray doesn't respond 
to arrayWithObjects". How then am I supposed to initalise this subclass?

(And the reason this is a subclass is because I want to use it as a 
data source for an NSTableView, for which I have to define two extra 
methods, and this is the only way I know how at the moment. I hear 
something called "categories" might be useful, but haven't learned 
about this yet).

Christopher Culver