title: Is it no longer possible to create custom sheets in Mavericks?
body: <p>According to Apple's <a href="https://developer.apple.com/library/mac/documentation/Cocoa/Conceptual/Sheets/Tasks/UsingCustomSheets.html#//apple_ref/doc/uid/20001290-BABFIBIA" rel="nofollow">Sheet Programming Topics</a>, to create a custom sheet for use with some kind of modal operation, one just needs to invoke NSApp's <code>beginSheet:modalForWindow:modalDelegate:didEndSelector:contextInfo:</code> method. However, it looks as though this method has been deprecated in OS X 10.9 in favor of the other block-based methods. I'm fine with using blocks, but there doesn't seem to be any other way to customize the style/design of the sheet. The problem is, my UI is dark, and I really want to have a unified interface. Am I missing something, or am I going to have to roll my own? Any hints, tips, or tricks welcome!</p>