Runtime FormLookup

Query query = new Query();
    QueryBuildDataSource queryBuildDataSource;
    QueryBuildRange queryBuildRange;
    SysTableLookup sysTableLookup = SysTableLookup::newParameters(tableNum(TableTaskCreationRules), this);
    TableId tableId;
    FieldId fieldId;
    ;
    tableId = tablename2id("TableTaskCreationRules");
    fieldId = fieldname2id(tableId, "CreationRule");
    sysTableLookup.addLookupfield(fieldId, true);
    fieldId = fieldname2id(tableId, "CreationDesc");
    sysTableLookup.addLookupfield(fieldId);
    fieldId = fieldname2id(tableId, "CreationMode");
    sysTableLookup.addLookupfield(fieldId);
    queryBuildDataSource = query.addDataSource(tableId);
    queryBuildRange      = queryBuildDataSource.addRange(fieldNum(TableTaskCreationRules, TaskType));
    queryBuildRange.value(enum2str(TaskType::Picking));
    sysTableLookup.parmQuery(query);
    sysTableLookup.performFormLookup();