In fact, subclassing from Bitmap won't help you. Because setAchorPoint only effects the position of the Texture attached to it and doesn't effect the child sprites.
You can add your sprite to another sprite as a child and imitate the functionally of setAnchorPoint. (Currently I'm not sure setAnchorPoint function will be available to Sprite or not)
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You can add your sprite to another sprite as a child and imitate the functionally of setAnchorPoint. (Currently I'm not sure setAnchorPoint function will be available to Sprite or not)
https://sites.google.com/site/xraystudiogame