Accessing a Button Click From Datagridview Column Button

Hola,


If i have created a datagridview (visiual studio) and made one of the Columns a BUTTON, How do I access that button in code?
If the DGV has 3 rows and thus 3 buttons, one for each row, how do I know with one is clicked, and where to I put the code for when the button is clicked.

thanks for any help!