title: Tablesorter filter buildSelect with ajax does not work properly
body: <p>I build a filter select via ajaxProcessing function only if ajax returns filter_listbox object: </p>
  
  <p>$.tablesorter.filter.buildSelect( "table", key, data.filter_listbox[value], true );</p>
  
  <pre><code>  ajaxProcessing: function(data){
      if (data &amp;&amp; data.hasOwnProperty('rows')) {
        var indx, r, row, c, d = data.rows,
        total = data.total_rows, // total number of rows (required)
        headers = data.headers, // array of header names (optional)
        headerXref = headers.join(',').replace(/\s+/g,'').split(','), // cross-reference to match JSON key within data (no spaces)
        rows = [], // all rows: array of arrays; each internal array has the table cell data for that row
        len = d.length; // len should match pager set size (c.size)
        // rows
        for ( r=0; r &lt; len; r++ ) {
          row = []; // new row array
          for ( c in d[r] ) { // cells
            if (typeof(c) === "string") { // match the key with the header to get the proper column index
              indx = $.inArray( c, headerXref );
              if (indx &gt;= 0) { // add each table cell data to row array
                if (indx == 0) row[indx] = '&lt;input type="checkbox" value="'+d[r][c]+'" /&gt;'; // input in first column
                else row[indx] = d[r][c];
              }
            }
          }
          rows.push(row); // add new row array to rows array
        }
  
        // Select list on filter in column with index 3
        if (typeof data.filter_listbox !== 'undefined'){
          $.each(headers, function(key, value) {
              //alert(value+" "+data.filter_listbox[value]);
              $.tablesorter.filter.buildSelect( "table", key, data.filter_listbox[value], true );
          });
        }
  
        // in version 2.10, you can optionally return $(rows) a set of table rows within a jQuery object
        // return [ total, rows, headers ]; // Also change headers
        return [ total, rows ];
      }
    },
  </code></pre>
  
  <p>Selectlist is built nicely, but if I choose an option from select, option is not selected in select list. Ajax returns data perfectlly, but if I click anywhere on the screen, table is updated like I would choose option with empty value and selectlist is broken. Can someone please help me to prevent this update and show properly selected option in the selectlist?</p>