CBS_DROPDOWN Similar to CBS_SIMPLE, except that the list box is not displayed unless the user selects an icon next to the edit control. CBS_DROPDOWNLIST Similar to CBS_DROPDOWN, except that the edit control is replaced by a static-text item that displays the current selection in the list box.
工作都正常,但是就是这个Type 是 Drop List 的 Combobox 控件 不正常。