Step to initialize checkbox in first column

          List column = new grid.ColumnList.fromMap([... ]);
          var checkboxCol = grid.CheckboxSelectColumnV2({'cssClass': "slick-cell-checkboxsel"});
          column.insert(0, checkboxCol.getColumnDefinition());
        
        

Step to handle selection row change

            var rsm = grid.RowSelectionModel({'selectActiveRow': true});
            sg.onSelectedRowsChanged.subscribe((var e, args) {
                rsm.getSelectedRows().forEach(print);
            });
            sg.setSelectionModel(rsm);
        

reset to 500k row del row mutiple select

• use shift key to select consecutive rows
• use cmd key or checkbox to select mutiple rows
• checked row won't reflex change if direct insert row before any checked one
• assign new data will reset selected rows
• reordered row also change selected rows