This is my first time making a document application and I am trying to set it so all the windows have an orange background. Here is my code: Code: [window setBackgroundColor:[NSColor orangeColor]]; I get an error saying 'window' is undeclared. By the way I am putting this code in the Xcode generated MyDocument.m file. My question is how is the default window it gives you declared(the one that says your document contents here)? I know in a regular Cocoa application it is declared as window. What is it called in a document based application? Or how do I change the background of it programmatically?