Animation is not working as expeced

I implemented corePlot in xcode and I'm using the pie chart. I'm trying to create a 3d flip animation while the chart reloads. Here is the code:

CABasicAnimation *scaleAnimation = [CABasicAnimation animationWithKeyPath:@"transform.scale.x"];
scaleAnimation.fromValue = [NSNumber numberWithFloat:1.0];
scaleAnimation.toValue = [NSNumber numberWithFloat:0.5];
scaleAnimation.duration = 1.0f;
scaleAnimation.removedOnCompletion = NO;
[self.pieChart addAnimation:scaleAnimation forKey:@"scale"];

[self.pieChart reloadData];

CABasicAnimation *animation = [CABasicAnimation animationWithKeyPath:@"transform.scale.x"];
animation.fromValue = [NSNumber numberWithFloat:0.5];
animation.toValue = [NSNumber numberWithFloat:1.0];
animation.duration = 1.0f;
[self.pieChart addAnimation:animation forKey:@"scale"];

I didn't get desirable effects. I think what's happening is, both animations are happening at once. (Though I'm not sure that is what's happening.)

Also, is it possible to add z-depth? If so, how?