关于C#TabControl中动态添加控件的问题

我的TabControl中有两个TabPage 我想动态的在两个TabPage中添加Label控件 但运行后只有第二个TabPage中能看到这些Label 第一个TabPage中看不到 for (int i = 0; i < seatX; i++)
            {
                for (int j = 0; j < seatY; j++)
                {
                    Label label = new Label();
                    label.AutoSize = false;
                    label.ContextMenuStrip = this.cmsSeatMenu;
                    label.BackColor = Color.Green;
                    label.TextAlign = ContentAlignment.MiddleCenter;
                    label.Size = new Size(70, 30);
                    label.Text = string.Format("{0} - {1}", i + 1, j + 1);
                    label.Location = new Point(20 + 90 * j, 40 + 50 * i);
                    label.Click += new EventHandler(label_Click);
                    tpRoom1.Controls.Add(label);
                    tpRoom2.Controls.Add(label);
                    labels.Add(label.Text, label);
                    Seat seat = new Seat(label.Text, Color.Green);
                    cinema.Rooms["一号放映厅"].Seats.Add(seat.SeatNum, seat);
                    cinema.Rooms["二号放映厅"].Seats.Add(seat.SeatNum, seat);
                }
            }