There are three locations that return a ZERO for row or column

• On the row lablel.
• On the column label.
• Below the last row of data but still within the viewing area.

class tableviewer1 extends sashelp.classes.tableviewer_c.class;      
    public char runObjectLabel    / (state='o', initialValue='SingleClick');    
    public num  borderTitleOffset / (state='o', initialValue=5);                
    public char borderTitle       / (state='o', initialValue='Click to Select');
    public char backgroundColor   / (state='o', initialValue='Syssecb');        
    public char columnLabels      / (state='o', initialValue='Yes');            

    public list gSelected   / (sendEvent='N');
    public list row         / (sendEvent='N');                       
    public list column      / (sendEvent='N');                       
    public list lastSelect  / (sendEvent='N');                    
                                                                     
    _select: method / (state='o');                             
        _super();                                              
        _getActiveCell(row, column);                           
                                                               
        if listlen(row)=0 or listlen(column)=0 then do;        
            _clearSelect();                                    
            _clearActiveCell();                                
                                                               
            if listlen(lastSelect) then _selectRow(lastSelect);
            return;                                            
        end;                                                   
                                                               
        if getitemn(row)=0 or getitemn(column)=0 then do;      
            _clearSelect();                                    
            _clearActiveCell();                                
                                                               
            if listlen(lastSelect) then _selectRow(lastSelect);
            return;                                            
        end;                                                   
                                                               
        _clearSelect();                                         
        _clearActiveCell();        
        _selectRow(row);     
        
        setnitemn(gSelected, getitemn(row), 'selected row');
        modelid.runInterface();     
                          
        _refresh();                                         
    endmethod;                                                 
           
    _popup: method arg1 arg2:num / (state='o');                      
    endmethod;                                                       
endclass;