LBN_SELCANCEL
The LBN_SELCANCEL notification message is sent when the user cancels the selection in a list box. The parent window of the list box receives this notification message through a WM_COMMAND message.
wParam
Specifies the identifier of the list box.
lParam
Specifies the handle of the list box in the low-order word, and specifies the LBN_SELCANCEL notification message in the high-order word.
This notification applies only to a list box that has the LBS_NOTIFY style.