The Celltype is called ListboxColumnType
Listbox1.SetColumnType(0, **ListBoxColumnType**.Editable) # <-- ok for a column
Listbox1.SetCellType(ListBox1.RowCount - 1, 1, **ListBoxColumnType**.CheckBox) # <- the cell has also a ListboxColumnType
Proposed Solution
Maybe the ListboxColumnType should be renamed to ListboxCellType.
Alternatives Considered
If this enum is just added, we would have two identical enums...