button.addSelectionListener(new SelectionListener() {
            
            @Override
            public void widgetSelected(SelectionEvent e) {
                natTable.getSelectionLayer().selectAll();
                ...
                [b]// then get selected list according to natTable.getSelectionLayer().getSelectedRowPositions().[/b]
            }
            
            @Override
            public void widgetDefaultSelected(SelectionEvent e) {
                // TODO Auto-generated method stub
                
            }
        });