// grid.setSelectionModel(new RowSelectionModel(false));
ToolbarMenuButton tbb = new ToolbarMenuButton(constants.Modify(), menu);
tb.addButton(tbb);
grid.add(tb);
grid.addEditorGridListener(new EditorGridListenerAdapter() {
@Override
public void onAfterEdit(GridPanel grid, Record record, String field, Object newValue, Object oldValue,
int rowIndex, int colIndex) {
model.setValue(field, rowIndex, (String) newValue);
}