I have an older MacOS app where in IB (no storyboards) I created a main window/view and a progress window/view in one xib in response to a menu item. In a new MacOS app (using much of the code from the older menu item code), in IB storyboard I have a window controller/window/view/subviews in the storyboard, but I cannot seem to find a way to also include in the storyboard a progress panel (to hook up to an outlet in the view controller). I can create the same window/panel/progress bar that I had in the older app in a separate xib. So I suppose (in objective c) I can just load the xib??? So, is there a better way to implement a separate progress window(s) in a storyboard and hook them up to outlets? I think I'm missing something And what happened to NSPanels?

Looking for a Cocoa example/tutorial in Objective C, on how to create a 400x90 pixel panel with outlets for a progress bar, textfield and a button (stop) to display temporarily while images are loading. I've added a WindowController + xib to the app's main storyboard but don't know how to use it to access the outlets in the progress panel.