Using sheets

I am writing a simple little program to learn the basic ins and outs of XCode and Cocoa. Right now, I'm trying to have pop-up sheets (like the open/save file dialogs), I'm calling:

Code:

[NSApp beginSheet: Panel modalForWindow: MainWindow modalDelegate:self didEndSelector:NULL contextInfo:nil];

and all that happens is that the panel does is pop up in the predetermined location.
The settings for Panel is attached.

I hope this is enough information.

 

That DID help. Thanks loads! It is great to find a great community that is knowledgeable.