dataSet Lookup code for enterprise portal ax 2012

 List list; Query query;  
 args = new Args(); list = new List(Types::String);  
  list.addEnd(fieldstr(ProjTable, ProjId));  
  list.addEnd(fieldstr(ProjTable, Name));  
 list.addEnd(fieldstr(ProjTable, Status));  
  sysDataSetLookup.parmLookupFields(list);  
 sysDataSetLookup.parmSelectField('ProjId');  
 // Call query  
 query = projTimeSheet_ds.getProjectIDQuery();  
 // Pass the query to SysDataSetLookup so it result is rendered in the lookup page. sysDataSetLookup.parmQuery(query);