My Jtable head does not appear

Question

DefaultTableModel tabmod = new DefaultTableModel(new String[]{"No.PO", "No.detail PO", "TglPO", "Nama Compound", "Type", "Warna", "Qty", "part", "Deskripsi", "Keterangan"}, 0);
        String sql3 = "select NoPO, NouPO, TglPO, part, Qty from tbl_tmb where sisPart > '0'";
        try{
            stmt = lpi.createStatement();
            rs = stmt.executeQuery(sql3);
            while(rs.next()){
                String sql4 = "select b.nama, b.type, b.warna, a.Description, a.Ket, c.TglPengiriman from tbl_po_dtl as a left join tbl_daftar_item as b on a.NmBrg=b.id left join tbl_po as c on a.NoPO=c.NoPO where a.NoPO='"+ rs.getString("NoPO") +"' && a.NoUrutPO='"+ rs.getString("NouPO") +"'";
                try{
                    pst = mpi.prepareStatement(sql4);
                    ls = pst.executeQuery();
                    while(ls.next()){
                        String NoPO = rs.getString("NoPO");
                        String NouPO = rs.getString("NouPO");
                        String tglPO = ls.getString("TglPengiriman");
                        String NamCom = ls.getString("nama");
                        String type = ls.getString("type");
                        String warna = ls.getString("warna");
                        String Qty = rs.getString("Qty");
                        String part = rs.getString("part");
                        String desk = ls.getString("Description");
                        String ket = ls.getString("Ket");
                        tabmod.addRow(new Object[]{NoPO, NouPO, tglPO, NamCom, type, warna, Qty, part, desk, ket});
                    }
                }catch(SQLException e){
                    System.out.println(e.getMessage());
                }
            }
        }catch(SQLException e){
            System.out.println(e.getMessage());
        }
        tabut = new JTable();
        tabut.setModel(tabmod);
        tabut.setBounds(10, 70, 1325, 250);

the values are shown, but the header does not appear, what's wrong with my code? please help me.