X++ code For MultiselectLookup form from MultipleTables in ax 2012

public void lookup()

{

    Query query;

    QueryBuildDataSource qbds1,qbds2,qbds3;

    SysLookupMultiSelectCtrl msc;

   

    super();

    query = new Query();

    qbds1 = query.addDataSource(tableNum(CustTable));

    qbds1.fields().dynamic(NOYES::Yes);

    qbds1.fields().addField(fieldNum(CustTable,AccountNum)); //Lookupform contains only accountnum

    qbds2 = qbds1.addDataSource(tableNum(DirPartyTable));

    qbds2.fields().dynamic(NOYES::Yes);

    qbds2.fields().addField(fieldNum(DirPartyTable,Name)); //Lookupform contains only Name

    qbds3 = qbds2.addDataSource(tableNum(LogisticsElectronicAddress));

    qbds3.fields().dynamic(NOYES::yes);

    //Lookupform contains only Locator 

    qbds3.fields().addField(fieldNum(LogisticsElectronicAddress,locator));

   

    qbds2.relations(true);

    qbds3.relations(true);

    msc=SysLookupMultiSelectCtrl::constructWithQuery(element,StringEdit,query);

}