VS 2008 Add A Row To Unbound Grid With A Combobox.

I have an unbound DataGridView that I am trying to fill with data, but am having a problem with the combobox column. I create the columns like this:[code]That works, and I have my columns like I want them, but I don't know how to add a row AND select the appropriate item in the combobox. I am adding items like this:[code]I can't figure out how to set the combobox column. And to top it off, since I changed the column from a text column to a combobox column, the grid is throwing exceptions, although it doesn't tell me what's wrong, it just tells me to handle the dataerror event, and all that I can get from that is e.Context = 3 and I can't find out what that means. Probably a type mis-match, but I can't find the proper way do select from the combobox. The rows add OK, but when I scroll the combobox column into view the first item is selected then the errors get thrown.