title: insert an object to an NSMutablearray of NSDictionary
body: <p>I am trying to insert an object to an array of NSDictionary but cant find out how. all the examples show how to insert to an array with NSDictionary with insertObject:atIndex, but this one doesnt insert the object under a dictionary key. </p>
  
  <p>My array right now is the following:</p>
  
  <pre><code>NSArray *aaa = [NSArray arrayWithObjects:@"Disable" ,nil];
  NSDictionary *aaaDict = [NSDictionary dictionaryWithObject:aaa forKey:@"Computers"];
  NSArray *bbb = [NSArray arrayWithObjects:@"Enable", nil];
  NSDictionary *bbbDict = [NSDictionary dictionaryWithObject:bbb forKey:@"Computers"];
  NSArray *ccc = [NSArray arrayWithObjects:@"Enable", nil];
  NSDictionary *cccDict = [NSDictionary dictionaryWithObject:ccc forKey:@"Computers"];
  
  [listOfItems addObject:aaaDict];
  [listOfItems addObject:bbbDict];
  [listOfItems addObject:cccDict];
  </code></pre>
  
  <p>I would like to do this, but with a key "Computers":</p>
  
  <pre><code>   NSArray *ar = [NSArray arrayWithObjects:@"xxxx", @"yyyy", @"zzzz", nil];
      NSDictionary *arDict = [NSDictionary dictionaryWithObject:ar forKey:@"Computers"];
      [listOfItems insertObject:ar atIndex:1];
  </code></pre>
  
  <p>Again - it does add the new array but not under the key "Computers". What am I missing here?</p>
  
  <p>Thanks! </p>