jQuery Grid Plugin - jqGrid

Hi

we are using Jqgrid for the edit purpose and we have one of the column as dropdown. when i check this in IE 8 everything works fine. but incase of the firefox/chrome that dropdown does not have "Selected" attribute set for the selected item of the dropdown and because of that whenever we try to save it default to the 0 index and on save no value return and it throws an error.

Here is the snapshot of the code.

    colNames: ['RoleUID', 'Rolename', 'IsActiveRole'],
                colModel:
                [

                    { name: 'RoleUID', index: RoleUID, editrules: { number: true} },
                    { name: 'RoleName', index: 'Rolename', width: 160, edittype: 'select', editable: true},
                    { name: 'IsActiveRole', index: 'IsActiveRole', edittype: 'select', editable: true, editoptions: { value: "1:Yes;0:No"} }
                 
                ]

// this is the code to populate the Rolename value dynamically.

loadComplete: function() {

                    var RoleNameList = FillRoleNames();
                    jQuery("#dtCharges").setColProp('RoleName', { editoptions: { value: RoleNameList} });
                },

Please help me as I am trying to find this issue but really not successful till now. How can we fix this for the FF and chrome?