Indicates cancel of the selection in the list box.
A list box created with the LBS_NOTIFY style sends an LBN_SELCANCEL notification message to its parent window when the user cancels the selection in the list box.
Indicates change due to mouse or keyboard user input.
A list box created with the LBS_NOTIFY style sends an LBN_SELCHANGE notification message to its parent window when the selection is about to change due to mouse or keyboard user input.