Combo box in DataGridView

I have a combo box in the first column of a Datagridview. The
displaymember is the inventory item key. I set the selectedvalue to the
item description.

I have an event for "OnEditControlShowing" of the grid that checks to
see if I'm on the combobox column, and if so, checks the selectedvalue
to make sure it's not null. If both these tests pass, it wires up an
event to the selectedchange on the combobox. This event populates the
2nd column with the selectedvalue of the combobox.

Problem #1, I have to click on the combo twice to get it to drop down.

Problem #2, there is no problem on the first row, but when I click on
the combo and get it to dropdown on rows after the first one, the
description displays "System.Data.DataRowView". How can I trap for this
value so it doesn't display?

Thanks,

PF