XPmouseRow()
 Get and/or Set the Mouse row position
------------------------------------------------------------------------------

   Function:   XPmouseRow()

               This function will return and optionally set the
               Row position of the Mouse.

   Syntax:     XPmouseRow([<nRow>]) --> nMouseRow

   Arguments:  <nRow> is the Row to position the Mouse cursor.
               Note that is is optionnal.

   Returns:    the Current Row position in the normal Clipper
               range of 0..MaxRow().

   Usage:      * Set the Mouse at the Bottom..
                         XPmouseRow(MaxRow())