NSMutableArray access from other class

FROM : Davide Scheriani
DATE : Fri Feb 01 19:44:03 2008

hello!
ive got a Window Panel with a nice NSTableView.
I called the class "MyClass" where delegate and dataSource.
Ive got 2 colums where I have assigned the identifer as "param" and 
"paramValue".
Till here nothing to worry. I just implemented the delegates and the 
chance to edit the cells.

Ive got even two NSMutableArray and a NSDictionary.

-(id)init{
   [super init];
   params = [[NSMutableArray alloc] init];
   paramsValue = [[NSMutableArray alloc] init];

   extraDictArray = [[NSMutableDictionary alloc] initWithCapacity:2];
   [extraDictArray setObject:params forKey:@"param"];
   [extraDictArray setObject:paramsValue forKey:@"paramValue"];
   
   return self;
}

- (int)numberOfRowsInTableView:(NSTableView *)tableView {
   return [params count];
}

- (id)tableView:(NSTableView *)tableView
           objectValueForTableColumn:(NSTableColumn *)tableColumn
           row:(int)row {
   NSParameterAssert(row >= 0 && row < [params count]);
   NSArray *theValue = [extraDictArray objectForKey:[tableColumn 
identifier]];
   return [theValue objectAtIndex:row];
}

- (void)tableView:(NSTableView *)aTableView
           setObjectValue:(id)anObject
           forTableColumn:(NSTableColumn *)tableColumn
           row:(int)row {
   NSString *value = [[extraParamsTable selectedCell] stringValue];
   
   NSArray *theArray = [extraDictArray objectForKey:[tableColumn 
identifier]];
   [theArray replaceObjectAtIndex:row withObject:value];
}

and just for the record ive got an NSTextView where I print out the 
param and the paramValue
so I know that it works.All the datas into the two array are added 
with no problem and everything works fine.
Now Ive got another class "MySecondClass", where I do want access this 
two NSMutableArray,
so I do this:

- (IBAction) updateParams:(id) sender{
   int row = [masterList selectedRow];
   NSLog(@">> %@",[[masterObj objectAtIndex:row] valueForKey:@"params"]);
}

what Ive got here is always an empty array..why?
call a metod (selector) inside the Panel (so the "MyClass") works, but 
from another class it doesnt works.
If I call another object like an NSString *test =@"hello!": like

NSLog(@">> %@",[[masterObj objectAtIndex:row] valueForKey:@"test"]);

it works..:( have no clue at all why.
and If I add some object inside the arrays outside the delegate method 
(ex in the init method)

-(id)init{
   [super init];
   params = [[NSMutableArray alloc] init];
   [params addObject:@"goofy1"];
   [params addObject:@"goofy2"];
   
   return self;
}

I get the array with the objects inside.It works.
any solutions?

tnx guys.