public static void clearPanel() {
        if (jTable_Inbox != null && jTable_Outbox != null && jTable8 != null) {
            ((OTInboxTableModel) jTable_Inbox.getModel()).clearValue();
            ((OTOutboxTableModel) jTable_Outbox.getModel()).clearValue();
            ((OTReceiptTableModel) jTable8.getModel()).clearValue();
        }
    }