NO! The bound column is the column that is saved. That is supposed to be the SupplierID. To control what shows in the combo, modify the Column Widths property.
"0", "2"
Will HIDE the id column (assuming that is first as it normally is) and SHOW the SupplierName field.
Make sure the column count property is correct and make sure that all columns are accounted for in the ColumnWidths property.