How to Create a Progress Panel in IB Storyboard and Access Outlets?

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.

How to Create a Progress Panel in IB Storyboard and Access Outlets?
 
 
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