Items from a comboBox to a dataGridView ¿?

Hi there guys, how can i pass the items from a comboBox to a dataGridView ? I have the comboBox filled with a column (attribute) from a table in the DataBase, when i click on a button (btnAdd) I wat to load all the tuple(from that table) of the selected item (attribute) in the comboBox to populates a row of the dataGridView. So i can add some items from the comboBox to a dataGridView. Please help me with this issue…i will apreciate to much.