grid is set multi selection mode with data container apis defined to fetch rows from the backend… but selectall checkbox is not displayed. Even though multi selection mode seems enabled perfectly as I am able to select more than one items on the grid.
you can enable the selectall checkbox with the following code snippet.
final MultiSelectionModel<BeanType> multiModel = (MultiSelectionModel<BeanType>) grid.getSelectionModel();
multiModel.setSelectAllCheckBoxVisibility(SelectAllCheckBoxVisibility.VISIBLE);
Regards
Olli