public void lookup()
{

     QueryBuildDataSource queryBuildDataSource;
    //super();
    //coded by fanddy, 
     SysTableLookup sysTableLookup = SysTableLookup::newParameters(tablenum(TIDInventLookup), this);

     Query query = new Query();

     queryBuildDataSource = query.addDataSource(tableNum(TIDInventLookup));
     sysTableLookup.addLookupfield(fieldnum(TIDInventLookup,NameAlias));
     sysTableLookup.addLookupfield(fieldnum(TIDInventLookup,DisplayProductNumber));
     sysTableLookup.addLookupfield(fieldnum(TIDInventLookup,Name));
     sysTableLookup.parmQuery(query);
     sysTableLookup.performFormLookup();

}