Lookup() and jumpref() methods in AX 2012

1. Lookup method we can write at table level, form Data source level and Form control level.
Now writing at Data source level(Form: Organization hierarchy, Table: Organization hierarchy)

public void lookup(FormControl _formControl, str _filterStr)
{
    SysTableLookup sysTableLookup =      SysTableLookup::newParameters(tableNum(DivisionTable), _formControl);
    Query query = new Query();
    QueryBuildDataSource qbds,qbds1;


    sysTableLookup.parmQuery(query);
    sysTableLookup.addLookupField(fieldNum(DivisionTable, DivisionCode));
    sysTableLookup.addLookupField(fieldNum(DivisionTable, DivisionName));
    qbds = Query.addDataSource(tableNum(DivisionTable));
    qbds1 = qbds.addDataSource(tableNum(DivisionCompanyLine));
    qbds1.relations(true);
    qbds1.addRange(fieldNum(DivisionCompanyLine, DataArea)).value(OrganizationHierarchy.Company);

    sysTableLookup.parmQuery(query);
    sysTableLookup.performFormLookup();
}

2. Writing jumpref() at Form DS level

public void jumpRef()
{
    Args            args;
    MenuFunction    menuFunction;
    ;
    args = new Args();
    menuFunction = new MenuFunction(menuitemDisplayStr(MenuItemName), MenuItemType::Display);
    args = new Args(menuFunction.object());
    args.caller(element);
    menuFunction.run(args);
}