This message selects a string and scrolls it into view, if necessary. When the new string is selected, the list box removes the highlight from the previously selected string.
wParam
Contains the index of the string that is selected. If wParam is -1, the list box is set to have no selection.
lParam
This parameter is not used.
The return value is LB_ERR if an error occurs.
This message should be used only with single-selection list boxes. It cannot be used to set or remove a selection in a multiple-selection list box.