Cocos2dx content size and drawing

Why CCNode can draw outside content size? How i can set size of cannvas for drawing such CCNode?

For example i have CCSprite 50 x 50 i set content size to 2 x 2 and it still draw as before set content size. Why it is made in this way?

Resolution http://www.cocos2d-x.org/boards/6/topics/7840