Cocos2d - how to scale two CCNodes with respect to each other

Question

I have two CCNodes in Cocos2d that I want to dynamically scale in sync with each other. Both CCNodes are background nodes. Visually one CCNode, NodeA, is above the other CCNode, NodeB in the y direction. But when I scale both nodes at the same time as in the code below:

Edit #1 -

Node B is part of a CCLayer, HUDLayer. The HUDLayer doesn't scale but NodeB in the HUDLayer does scale. So the code looks like

NodeA.anchorPoint = ccp(0.5f, 0.0f);
NodeA.scale = scale;
HUDLayer.NodeB.anchorPoint = ccp(0.5f, 0.0f);
HUDLayer.NodeB.scale = scale;

4)  Would NodeB being part of a CCLayer effect the Nodes scaled relative positions?

End Edit #1

Edit #2

 The contentSize of CCNode is (0,0).  How do I set the contentSize of CCNode manually?

End Edit #2

Edit #3

I found this post where one of the answers talks about setting a CCNode's relativeToAnchorPoint property to YES. I can't find how to do this on Google. Does anyone know how to set relativeToAnchorPoint?

End Edit #3

NodeA drops below NodeB in the y direction. So this brings up a few questions:

1)  Are CCNodes scaled with respect to an anchorPoint?
2)  Why is NodeA dropping below NodeB in the y direction?
3)  How can two CCNodes be scaled with their relative positions remaining constant?

Answer 1

1. Yes
2. see 1 especially if they are not the same size
3. set their anchorpoint to 0.5,0 so they both align on the bottom when scaling