jQuery Grid Plugin - jqGrid

Dear guys,

I have 2 colModel and I want to hide them on onInitializeForm

The Expired colModel works perfectly and neither does the Category.

Here is my script:

{name:'Category'    , index:'Category'    , width:120, align:"center" , editable:true, editoptions:{size:15}, editrules:{required:true}, edittype:"select", editoptions:{dataUrl:'filterselect/filterselectcategory.php'}},
{name:'Expired'      , index:'Expired'      , width:70 , align:'right'  , sorttype:'date', editable:false,  
      editoptions:{size:10,  
        dataInit:function(el){  
                $(el).datepicker({dateFormat:'dd-mm-yy'});  
            },  
            defaultValue: function(){  
                var currentTime = new Date();  
                var month = parseInt(currentTime.getMonth() + 1);  
                month = month <= 9 ? "0"+month : month; var day = currentTime.getDate();
                day = day <= 9 ? "0"+day : day;
                var year = currentTime.getFullYear();
                return day+"-"+month + "-"+year;
            }
        }, editrules:{required:false, date:true}, formoptions:{elmprefix:"(*)",elmsuffix:"  dd-mm-yyyy" }, formatter:'date', formatoptions: {srcformat:'Y-m-d',newformat:'d-m-Y'},
            searchoptions:{dataInit:function(el){$(el).datepicker({dateFormat:'dd-mm-yy'});}}
        }

{jqModal:true, top: 120, left: 480, width: 350, drag:false, resize:false, reloadAfterSubmit:true, closeOnEscape:true, checkOnUpdate:true, savekey: [true,13], navkeys: [true,38,40], checkOnSubmit : true, closeAfterEdit:true,
        onInitializeForm : function (formid){
             $("#KategoriKonsumen",formid).change(function() {
                  $("#NamaKonsumen",formid).hide();
                  $("#JatuhTempo",formid).hide();
             } 
        }
  }// edit options

Here is php side:

<?php
include '../config/connections.php';
 
echo "<select>";
$query="SELECT * FROM category ORDER BY Name";
$result = $db->query($query);
echo "<option value=''></option>";
$numresult=$result->num_rows;
for ($i=0; $i<$numresult; $i++)
    {
    $row = $result->fetch_assoc();
       echo "<option value='$row[Name]'>$row[Name]</option>";
    }
echo "</select>";
?>

could anybody help me here???Thank you before

Regards,

Candra