final GridPanel grid = new GridPanel(store, cm);
grid.setStripeRows(true);
GroupingView gv = new GroupingView();
//to stretch it out
gv.setForceFit(true);
gv.setGroupTextTpl("{text} ({[values.rs.length]} {[values.rs.length > 1 ? \"" //NON-NLS
+ constants.Items() +"\" : \"" + constants.Item() + "\"]})");
grid.setView(gv);