Being a OS X user, you must be quite familiar with the "New Documents" window when you start some of these star apps: Pages, Pixelmator, Sketch and so on. I'm building a document-based app, and I want to popup this window when user launches my app. This window is so common, that I 99% sure it is a system-provided window. But I couldn't find it. I can mimic the window, but this process must be really tedious and buggy. For example, I have to manage the list-style switch using NSBrowser, NSSourceList and NSTableList, also, there are bunch of code managing drag and drop, search, iCloud integration... The list must be pretty long, and I felt this wheel is really not needed to be reinvented... So, my question is how can I implement this window, is there any documentation writing about this window? Big thanks!