dataGrid = new DataGrid<UsageReference>(Integer.MAX_VALUE, CSVGridResources.INSTANCE);
dataGrid.addColumn(new EntityColumn(), "Entity");
dataGrid.addColumn(new EntityTypeColumn(), "Type");
dataGrid.addColumn(new AxiomTypeColumn(), "Axiom Type");
dataGrid.addColumn(new Column<UsageReference, SafeHtml>(new SafeHtmlCell()) {
@Override
public SafeHtml getValue(UsageReference object) {
SafeHtmlBuilder builder = new SafeHtmlBuilder();
builder.appendHtmlConstant(object.getAxiomRendering());
return builder.toSafeHtml();