NSUndoManager but Undo and Redo Menu Items are Disabled?

FROM : joe OneNinetyTwo
DATE : Sun Aug 13 23:24:08 2006

I had NSMutableArray's of my model objects inside
MyDocument.  I was viewing these model objects with
an NSTable in the window of MyDocument.nib.    I have
implemented Undo, and had everything working just
fine. 

Then I decided to move the NSMutableArray's of my
model objects into a class called DataSet.  I alloc
and init my model class DataSet inside MyDocument init
with

- (id) init
{
    self = [super init];
    if (self) {
       dataSet = [[DataSet alloc] initWithUndoManager:
[self undoManager]];
    }
    return self;
}

Inside DataSet class I send the
prepareWithInvocationTarget message to the undoManager
to load the stack, as before.

Except now, the Undo and Redo menu items are disabled,
and I can no longer undo and redo.    Can anyone
please tell me what I'm doing wrong here?

Thanks,

Philip





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