The size and location of the window or view at the start of the animation.
The size and location are specified by an NSRect structure encoded in an NSValue object. This property is optional. If it is not specified, NSViewAnimation uses the frame of the window or view at the start of the animation.
Available in Mac OS X v10.4 and later.
Declaration Syntax Version Information- Available in Monobjc Bridge: 10.6 (For Mac OS X 10.6 and later), 10.5 (For Mac OS X 10.5 and later)