Set the current selection for a list box.
LBSET dlg_id id index
dlg_id Specifies the identifier of the dialog box that contains the list box. id Specifies the identifier of the list box. index Specifies the index of a string contained in the specified list box which will be set as the current selection.
Indexes are zero based, that is, the first string in the list box is at index 0, the second string is at index 1 and so on.
If parameter index is specified with a value of -1 then the list box is set to have no selection.