Save button does not come up after making reference required field

[deepa]

Hi

 

I have a question to ask,

 

When i add a new product into the system using admin interface, only after editing product name, save button in toolbar gets appeared. But i am not able to find in code, how this thing is managed. Can you please show me the place where the code is written for the same.

 

I want to do this for the scenario,

 

I made reference field as mandatory field by editing classes/product.php file. Now in browser, when i submit the product form without filling reference, it shows me an error but save button does not appear untill i edit the product name.

 

 

Any idea on this?

 

 

Thanks