NSArrayController: Objects with empty strings

[MyApps]

Hi list,

I am new to the cocoa development. I have some question to  
NSArrayController

I add an object to the controller array like this:

CODE  
##############################################################################

NSMutableDictionary *theDicRow = [NSMutableDictionary  
dictionaryWithObjectsAndKeys:
         @"Text A", @"colA",
         @"Text B", @"colB",
        nil ];

[myArrayController addObject:theDicRow];

CODE  
##############################################################################


This works great and do its job.
I can call the object from the content an get the log result like this:

CODE  
##############################################################################

[2355:10b] (
        {
        colA = "Text A";
        colB = "Text B";
    }
)

CODE  
##############################################################################

Well, this is okay.


If I do this:

CODE  
##############################################################################

NSMutableDictionary *theDicRow = [NSMutableDictionary  
dictionaryWithObjectsAndKeys:
        @"Text A", @"colA",
        @"", @"colB",
        nil ];

CODE  
##############################################################################


The result is:

CODE  
##############################################################################

[2355:10b] (
        {
        colA = "Text A";
    }
)

CODE  
##############################################################################

But I wanna have the empty string back. So it seems, that the empty  
string is converted to nill and the controller is killing them out.
How can I change this reaction with empty strings? I need this @""  
Strings.

Thank you for information!
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