private void setupTestDetailsTree() { CellTree.Resources res = GWT.create(CellTree.BasicResources.class); final MultiSelectionModel<PlotNameDto> selectionModel = new MultiSelectionModel<PlotNameDto>(); taskDetailsTree = new CellTree(new TaskDataTreeViewModel(selectionModel, getResources()), null, res); taskDetailsTree.addStyleName(getResources().css().taskDetailsTree()); }