In AX 7 , Cross reference has been renamed as Find Reference .
Go to Application Explorer , AOT -> Data Types -> EDT -> Select any EDT and right click
You can find the “Find References” click on this and system will give all paths , where this EDT has been used like below screen shot :
Here you can click on “Go To Refernce” and system will show the code , where this object have been used.
Happy DAXing 🙂