How to override lookup

void SummaryProjectLookup(FormControl ctrl)
{
    SysTableLookup sysTableLookup = SysTableLookup::newParameters(tableNum(ProjTable),ctrl);
    Query query = New Query();
    QueryBuildDataSource queryBuildDataSource = query.addDataSource(tableNum(ProjTable));
    QueryBuildRange queryBuildRange;
    ;

    sysTableLookup.addLookupfield(fieldNum(ProjTable, ProjId));
    sysTableLookup.addLookupfield(fieldNum(ProjTable, Name));
    sysTableLookup.addLookupfield(fieldNum(ProjTable, Status));

    queryBuildRange = queryBuildDataSource.addRange(fieldNum(ProjTable, Type));
    queryBuildRange.value(queryValue(ProjType::Summary));
    sysTableLookup.parmQuery(query);
    sysTableLookup.performFormLookup();
}

public void lookup()
{
    element.SummaryProjectLookup(this);
}