Masking Animation in cocos2d-x

Masking Animation in cocos2d-x
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Hi I am new to cocos2d-x. I learn and test masking animation with 2 picture in flash. I want to ask masking animation in cocos2d-x. I found this example and try this.
But this tutorial is only target to show the masking two sprite in initialization of an application. I want to make masking animation with run time(update).
Thank you very much.