How to open a new window on button click in Cocoa Mac Application?

If you want to create a separate class for New Window, these are the steps:

1. Create a class which is a sub class of NSWindowController e.g. NewWindowController
2. Create a window xib for NewWindowController class.

3. On button click code as:

   NewWindowController *windowController = [[NewWindowController alloc] initWithWindowNibName:@"You Window XIB Name"];
   [windowController showWindow:self];