Here is a typical scenario: you click an element (in this case a textfield) but oops, you actually wanted the imageview behind it. The problem is your textfield is pretty blocking you from clicking the layer behind it. Prior to learning this trick, you probably opened Document Outline (or keep it open, wasting precious space) to navigate and select the view you needed to work with. Well instead you can ctrl+shift+click in the region your view is, and bring up a context menu which will show you all of the elements in that region within your scene. Pretty cool, considering you are working with a 3D plane in a 2D interface. This little menu can save you a lot of time once you make it a habit. Enjoy!