Here's my vision:

Around 30 ComboBox's (let's say 6 rows and 5 columns) and they are all in a DataGridView, so I can use some of the features of the datagridview.

I saw (accidentally) how it's possible to have checkboxes in a DataGridView, so I'm pretty certain it's possible to put a ComboBox in there (unless I'm totally wrong), but I'm not sure how.

Whoever can answer this is a l33t h8x0r extreme. thanks!