Update field in the subform

Update field in the subform

I have a problem, when I change a given in a Subform, eg, dumb a product of company A to company B, it does not update the data in the subform company B. 

He even updated in the database, but not in the subform. 

Once changed the owner of the product in the subform, I deleted it from the company, and want to know a way to populate the subform company B. 

Anyone have any ideas? 

tried using 

row.SubFormField = input.FormField; 

but it still fails. 

att.