Displaying a datagridview in place of a dropdown list for a combobox

[polaris431]

I would like to have a combobox control that when clicked, displays a
DataGridView in-place of the normal dropdown list. I want it to be a
DataGridView with editing capabilities. The DataGridView would be bound
to a database. Microsoft Access has had this capability for years. I've
scrounged the Internet including the CodeProject but can't find any
free controls or source code. Does anyone know where I can find
something like this? If not, I'll have to roll my own.

Thanks