How to listen a content changed event on a div/table using GWT?

I write a gwt client to append one row data on a specific table, 

but if the page display is part-updated with AJAX, the row I added disappears, how can I add a listener to catch the event of div updated?

public void onModuleLoad() {

    TableElement info_table =

        TableElement.as(Document.get().getElementById("key_Table"));

    String owner = "lora";

    if (info_table != null) {

      TableRowElement newR = info_table.insertRow(-1);

      newR.insertCell(0).setInnerHTML("<div>Owner</div>");

      newR.insertCell(1).setInnerHTML(

          "<div>" + owner + "</div>");

    }

  }

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