finally i found my error in our module. the error in my config.xml i was rewrite the product edit tabs.
<rewrite>
Question
i am creating extension when we enable my extension then the add new product page cant work and give the error in firebuger 'ReferenceError: product_info_tabsJsTabs is not defined'. my products grid appear in the back end but i add new product they does not show the new product tab. Catalog > Manage Products > Add new Product. Any help would be great! Thank you!
Solution
finally i found my error in our module. the error in my config.xml i was rewrite the product edit tabs.
<rewrite>