How to make the NSAlert's 2nd button the return button?

I'd like to make something like this NSAlert:

As you can see, the 'return' button is the second one. How can I do this?
Here's an example of the code that I use to create my NSAlert, but the first button gets the focus:

NSAlert *alert = [[NSAlert alloc] init];
[alert setMessageText:@"Are you sure you want to disconnect?"];
[alert addButtonWithTitle:@"Disconnect"];
[alert addButtonWithTitle:@"Cancel"];
[alert runModal];

I want to focus the "Cancel" button. Any ideas? Thanks!

To change the key equivalents for the NSButton elements inside of the NSAlert object, you'll have to access the buttons directly (after creation and before -runModal) and change the key equivalents using the -setKeyEquivalent: method.

For example, to set the Disconnect to be ESC and the Cancel to be return, you would do the following:

NSArray *buttons = [alert buttons];
// note: rightmost button is index 0
[[buttons objectAtIndex:1] setKeyEquivalent: @"\033"];
[[buttons objectAtIndex:0] setKeyEquivalent:@"\r"];

before calling -runModal