WM_CONTROL (in List Boxes) - Parameters

id (USHORT)

Control-window identity.

usnotifycode (USHORT)

Notify code.

The list box control window procedure uses these notification codes:

LN_ENTER

Either the Enter or Return key has been pressed while the list box control has the focus, or the list box control has been double-clicked.
LN_KILLFOCUS
The list box control loses the focus.
LN_SCROLL
The list box control is about to scroll horizontally. This can happen when the application has issued a WinScrollWindow function.
LN_SETFOCUS
The list box control receives the focus.
LN_SELECT
An item is being selected (or deselected).

Note: To discover the index of the selected item, the application must use the LM_QUERYSELECTION message.

hwndcontrolspec (HWND)

List box control window handle.

ulReserved (ULONG)

Reserved value, should be 0.

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