Add "setCenter:" to CPView, which takes a point and moves the center of the view's frame to that point.

AppKit/CPView.j

@@ -561,6 +561,18 @@ var DOMElementPrototype         = nil,
     return _CGRectMakeCopy(_frame);
 }
 
+/*!
+    Moves the center of the receiver's frame to the provided point. The point is defined in the superview's coordinate system. 
+    The method posts a CPViewFrameDidChangeNotification to the default notification center if the receiver 
+    is configured to do so. If the specified origin is the same as the frame's current origin, the method will 
+    simply return (and no notification will be posted).
+    @param aPoint the new origin point
+*/
+- (void)setCenter:(CGPoint)aPoint
+{
+    [self setFrameOrigin:CGPointMake(aPoint.x - _frame.size.width / 2.0, aPoint.y - _frame.size.height / 2.0)]; 
+}
+
 /*!
     Sets the receiver's frame origin to the provided point. The point is defined in the superview's coordinate system. 
     The method posts a CPViewFrameDidChangeNotification to the default notification center if the receiver