[code=c]
...
case WM_CREATE: 
...
  hwComboBox = CreateWindow(TEXT("COMBOBOX"), NULL,
                     WS_CHILD | WS_TABSTOP |                                 WS_VISIBLE | WS_VSCROLL | CBS_DROPDOWN ,                         500,140, 100, 30, hwnd, NULL,                              (HINSTANCE)GetWindowLong(hwnd, GWL_HINSTANCE), NULL);
  
  SendMessage(hwComboBox, CB_RESETCONTENT, 0, 0);
  SendMessage(hwComboBox, CB_ADDSTRING, 0, (LPARAM)TEXT("文本1"));
  SendMessage(hwComboBox, CB_ADDSTRING, 0, (LPARAM)TEXT("文本2"));
  SendMessage(hwComboBox, CB_ADDSTRING, 0, (LPARAM)TEXT("文本3"));        
  SendMessage(hwComboBox, CB_SETCURSEL, 0, 0);
...

[/code]

为什么控件中的下拉菜单里面什么也没有？