title: How to put a computed observable as a cell data in Handsontable
body: <p>I have already integration of Handsontable with KnockoutJS here <a href="http://jsfiddle.net/NHpEH/" rel="nofollow">http://jsfiddle.net/NHpEH</a>.</p>
  
  <pre><code>     ko.bindingHandlers.handsontable = {
          init: function (element, valueAccessor, allBindingsAccessor) {
              var value = valueAccessor(); // TODO: what happens if value is null?         
              var allBindings = allBindingsAccessor();
              var colHeaders = allBindings.colHeaders() || true;
              var data = allBindings.handsontable();
  
              // TODO: make options customizable
              $(element).handsontable({
                  data: data,
                  minRows: value().length || 5,
                  minCols: value()[0].length || 5,
                  minSpareCols: 0,
                  minSpareRows: 1,
                  colHeaders: colHeaders,
                  contextMenu: true,
                  onChange: function (data, source) {
                      var headers = $(element).handsontable("getColHeader")
                      var tableData = $(element).handsontable("getData");
  
                      value(tableData);
  
                      allBindings.colHeaders(headers);
                  }
              });
  
              $(element).handsontable("loadData", value());
          },
          update: function (element, valueAccessor, allBindingsAccessor) {
              var value = valueAccessor();
              var valueUnwrapped = ko.utils.unwrapObservable(value);
              var allBindings = allBindingsAccessor();
              var colHeaders = allBindings.colHeaders();
  
              $(element).handsontable("updateSettings", {
                  minRows: value().length,
                  minCols: value()[0].length
              });
          }
      };
  </code></pre>
  
  <p>but I want to put a computed observable as a cell data in a cell. For example I want to show sum of two other cells in a cell. </p>
  
  <p>Any idea would be appreciated. </p>