给它sendmessage一个单击的消息就可以了
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An application sends a CB_SHOWDROPDOWN message to show or hide the list box of a combo box that has the CBS_DROPDOWN or CBS_DROPDOWNLIST style. CB_SHOWDROPDOWN
wParam = (WPARAM) (BOOL) fShow; // the show/hide flag
lParam = 0; // not used; must be zero
Parameters
fShow
Value of wParam. Specifies whether the drop-down list box is to be shown or hidden. A value of TRUE shows the list box; a value of FALSE hides it.
Return Values
The return value is always TRUE. Res
This message has no effect on a combo box created with the CBS_SIMPLE style. QuickInfo
Windows NT: Requires version 3.1 or later.
Windows: Requires Windows 95 or later.
Windows CE: Requires version 1.0 or later.
Header: Declared in winuser.h.See Also
Combo Boxes Overview, Combo Box Messages, CB_GETDROPPEDSTATE
An application sends a CB_SHOWDROPDOWN message to show or hide the list box of a combo box that has the CBS_DROPDOWN or CBS_DROPDOWNLIST style. CB_SHOWDROPDOWN
wParam = (WPARAM) (BOOL) fShow; // the show/hide flag
lParam = 0; // not used; must be zero
Parameters
fShow
Value of wParam. Specifies whether the drop-down list box is to be shown or hidden. A value of TRUE shows the list box; a value of FALSE hides it.
Return Values
The return value is always TRUE. Res
This message has no effect on a combo box created with the CBS_SIMPLE style. QuickInfo
Windows NT: Requires version 3.1 or later.
Windows: Requires Windows 95 or later.
Windows CE: Requires version 1.0 or later.
Header: Declared in winuser.h.See Also
Combo Boxes Overview, Combo Box Messages, CB_GETDROPPEDSTATE