Listview.Exchange -- exchange two entries
mui.DoMethod(id, "Exchange", pos1, pos2)
Exchange two entries in a list. Positions have to be passed as absolute values starting from 0 to
-1 or pass one of the following special values:
Use top entry.
Use active entry.
Use bottom entry.
Use next entry. This is only valid for the second parameter.
Use previous entry. This is only valid for the second parameter.
id of the listview object
number of the first entry
number of the second entry