### Combination Box Styles

OS/2 | Windows | Explanation
CBS_DROPDOWN | CBS_DROPDOWN | Creates a combination box containing an entry field with a drop-down icon that is visible at all times. When the drop-down icon is selected, the list box of the combination box is displayed, allowing the user to select an item from the displayed list; the item is placed in the entry field. Text can be entered or edited in the entry field.
CBS_DROPDOWNLIST | CBS_DROPDOWNLIST | Creates a combination box similar to the drop-down (CBS_DROPDOWN) option but prevents the user from entering or editing text in the entry field.
CBS_SIMPLE | CBS_SIMPLE | Creates a combination box containing an entry field and list box that are visible at all times. The combination box allows the user to select items from the list box; items are placed in the entry field. Text can be entered or edited in the entry field.
| CBS_AUTOHSCROLL | Causes the entry field portion of the combo box to scroll the text to the right when the user types a character at the end of the line. If not specified, the only the text that fits within the entry field is allowed.
| CBS_HASSTRINGS | Designates that the owner-drawn combo box contains string items, thereby allowing the application to use the LB_GETTEXT message to query the text of an item.
| CBS_NOINTEGRALHEIGHT | Prevents the height of the list box from being adjusted to a multiple of the item height. List boxes with this style could display partial items at the bottom of the box.
| CBS_OEMCONVERT | Converts the text entered in the combo box entry field from the ANSI character set to the OEM character set and then finally back to the ANSI character set.
| CBS_OWNERDRAWFIXED | Draws the list box portion of the combo box using a fixed height for each item. The list box owner is responsible for the contents.
| CBS_OWNERDRAWVARIABLE | Draws the list box portion of the combo box using a variable height for each item. The list box owner is responsible for the contents.
| CBS_SORT | Sorts the strings entered in the list box portion of the combo box.
- | WS_VSCROLL | Adds a vertical scroll bar to the right side of the list box. The bar allows the user to scroll the contents of the list box vertically.

OS/2 - Windows Styles Definitions: Detailed Descriptions
OS/2 - Windows Styles Definitions: Summary