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You can steal a disclosure triangle from another app’s .nib. For example, there’s one in: /Applications/Utilities/Process It’s just a toggle button with a left-pointing and a down-pointing icon.

I don’t have an answer for this one yet, but I’m looking. The basic idea is that I see this UI element everywhere, yet can’t figure out how to use it in my Cocoa app. I’ve got a window that I want to have a collapsed and an expanded state, kinda like the save panel or the Classic Startup window, or the software update dialog. I’ve managed to hack together my own expand-and-reveal/hide-and-collapse code, but I’m missing the disclosure arrow.


– LeslieOrchard, 27 Jul 2001

It’s not a UI element in Cocoa. You can fake it like PPP connect does, just have a look at their nib – it’s basically a button that changes its icon. This has been discussed several times on the cocoa-dev list at, btw.

– FinlayDobbie

Thanks, I’ll take a look there. I am on the cocoa-dev list and asked about it, but didn’t seem to get any answer. Figured I’d ask here too :)

– LeslieOrchard

In Panther, the disclosure triangle is a type of NSButton. What I would like to know is an easy way to resize a window with it.

When the button clicks, resize the window. There is no easier way than that.

You want to do window setFrame:newFrame display:YES animate:YES

There’s some discussion of window resizing at WhereIsCoolSystemPrefsWindowEffect.