trigger onchange event by load server data

I have following code to filter my second list from my list.

It works when user click the dropdown, since onchange event trigger.

I tried to load the data from stored procedure then the onchange event does not trigger, when user need update data then will see whole list without filtering.

I would like to know if it is possible to trigger onchange event when I load data from stored procedure,

Your help and information is great appreciated,

Regards,

Iccsi,

<td><select name="Mylst" id="Mylst">

         <cfoutput query="MySP">

                  <option value="#MySP.MyID#"

          <cfif (isDefined("form.MyID") AND form.MyID EQ MySP.MyID)>selected="selected"</cfif>> #MySP.MyName# </option>

          </cfoutput>

     </select></td>

$("#Mylst").change(function()

        {    $.ajax({

                     type: "GET",

                     url:   'Mycfc.cfc?method=GetMethod&MyParam='+ jQuery("#MyPrelsty").val(),

                     dataType: "json",

             cache: false,

                     success: function(data)

                     {

              $('#MySublst option').remove();

         $.each(data, function(i, obj)

                  {

             $("#MySublst").append('<option value=' + '"' + data[0] + '"' +'>' + data[1] +

'</option>')

           });

         }  

   });