delphi中利用COMBOBOX控件实现的首字母查询程序，不是很完善，但是可以实现功能-delphi using COMBOBOX controls to achieve the first letter of inquiry process is not perfect, but you can achieve functional

Sample code to operate with ComboBox dialog by WinApi only without standard Delphi VCL Libraries. All dialog parts is coded just by WinApi.