Icon for drop-down add (plus) button

I'm writing an app that shows a list of items. At the bottom of the list box I'm putting an add (plus) button, as is commonly seen in OS X. However, the behavior of this button is a little different. When clicked, it displays a drop-down menu of item types. The user chooses a type, and a new item of that type is added to the list.

My only problem is getting the look of the button just right. I'm trying to find some other app that has this kind of button, so that I may use it as a guide. I know I've seen such a button before, but for the life of me I just can't remember where. I thought it was in an Apple app that ships with OS X, but perhaps it was a third-party app instead. Any suggestions?

I've attached my current button graphic to illustrate what I mean.

Thanks.

 

Yep, Xcode's Organizer is exactly the kind of example I was looking for; thanks! (It's in 3.0 as well.)

 

I found another one: TextMate's Bundle Editor. The down arrow in its icon is slightly but noticeably larger than Xcode's version.

 

That site's only for the regular plus button. I needed the drop-down variant. Though it is helpful as a starting point for creating my own graphic.