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google maps not showing correctly in foundation tabs

I'm trying to add google map div inside of a foundation tab but it's not showing correctly inside of that, but also it's showing correctly out side of tab in same page. what i must do?! 

tnx.

 

tabstabmapGoogle

I'm trying to add google map div inside of a foundation tab but it's not showing correctly inside of that, but also it's showing correctly out side of tab in same page. what i must do?! 

tnx.