jQuery Grid Plugin - jqGrid

Hi there¡

I'm adding column chooser to my jqgrid, but i can't see it working.

I have read the warnings about import (css, js) and i think it's all ok, but...

My jqgrid:

$(function(){
  $("#list1").jqGrid({
        url:'./otro2.php',
        datatype: "xml",
        colNames: ['Title','Subtitle','Composer', 'Source', 'Year','Key','Fronimo','PDF','Midi','Tab'],
        colModel:
          [
            {name:'Title',index:'title', width:70, sorttype:"string",searchoptions:{sopt: ['cn']}},
            {name:'Subtitle', index:'subtitle', width:70, sorttype:"string",searchoptions:{sopt: ['cn']},hidden: true},
            {name:'Composer',index:'composer', width:50, sorttype:"string",searchoptions:{sopt: ['cn']}},            
            {name:'Source',index:'source', width:100, sorttype:"string",searchoptions:{sopt: ['cn']}},
            {name:'Year',index:'date', width:10, sorttype:"string",searchoptions:{sopt: ['cn']}},            
            {name:'Key',index:'key', width:10,sorttype:"string",searchoptions:{sopt: ['cn']}},        
            {name:'Fronimo',index:'Fronimo', width:15,sortable:false,search:false,formatter:ft3Formater},
            {name:'PDF',index:'PDF', width:10,sortable:false,search:false,formatter:pdfFormater},        
            {name:'Midi',index:'Midi', width:10,sortable:false,search:false,formatter:midiFormater}    ,
            {name:'Tab',index:'Tab', width:10,sortable:false,search:false,formatter:tabFormater}            
          ],
        autowidth: true,
        rowList:[100,200,500],
        pager: '#pager1',
        scrollOffset:0,
        toppager: true,
        loadtext: '<br/>&nbsp;&nbsp;&nbsp;&nbsp; ::::::::: searching :::::::::: &nbsp;&nbsp;&nbsp;&nbsp; <br/><br/>',
        altRows: true,
        rowNum:50,
        viewsortcols: [true,'horizontal',true],
        height:500,
        viewrecords: true,
        sortable:true,
        hoverrows: false,
        gridview: true
      });
      
      jQuery("#list1").jqGrid('navGrid','#pager1',{add:false,edit:false,del:false,view:true,search:true,cloneToTop:true, viewtext: "View selected tablature  ",searchtext:"Search tablatures  ",refreshtext:"Clear search parameters  "},
                  {}, // edit options
                  {}, // add options
                  {}, // del options
                  {}, // search options
                  {   // view options
                      beforeShowForm: function(form) {
                          $("tr#trv_Subtitle",form[0]).show();
                      },
                      afterclickPgButtons: function(whichbutton, form, rowid) {
                          $("tr#trv_Subtitle",form[0]).show();
                      }
                  });
      
    jQuery("#list1").jqGrid('navButtonAdd','#pager1',{ caption: "Columns", title: "Reorder Columns", onClickButton : function (){ jQuery("#list1").jqGrid('columnChooser'); } });

Any Idea¡¡