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Bindings
Many graphical objects in Cocoa have bindings. When you bind a key, such as fido, to an attribute of the graphical object (like its value or its font color), the view will automatically keep those in sync. You are going to add a slider, bind its value to fido, and see how it uses key-value coding to keep them in sync.
Open MainMenu.nib. Drop a slider on the window. In the Attributes Inspector, make the slider Continuous (Figure 7.2).
