How can I define a custom (datamember) view for a databound sealed object on a combobox?

Question

Take System.Drawing.Point for example. If wanted to bind a few points to a comboBox with a special view that displays:

Point 1: 1, Point 2: 2 Point 1: 5, Point 2: -3 ... Point 1: -7, Point 2: -6

Since I can not modify System.Drawing.Point, and I would like a solution that works for a large dataset coming from a database, is there a way on the comboBox, or BindingSource to customize what the display would show for each item (formatting + data from multiple properties) without having to load the objects into a wrapper class and retaining databinding?