具有按钮动作回调的JQuery UI对话框无法打开第二个对话框

<script>
$(document).ready(function() {
   $(\"#somebutton\").click(function() {
       $.get(\"someurl\", function(data){
          $(\"#PartsDialogDiv\").html(data);
          $(\"#PartsDialogDiv\").dialog(\"open\");
       });
    });


   $(\"#PartsDialogDiv\").dialog({
           autoOpen: false,
           width: 600,
           resizable: false,
           modal: true,
           buttons: {
               \"Use Part\": function() {
                   $.get(\"someurl\", function(data){
                       $(\"#AnotherDIV\").html(data);
                   });
                   $(this).dialog(\"close\");
               },
               \"Cancel\": function () {
                   $(this).dialog(\"close\");
               }
           }
     });
});
</script>
<div id=\"PartsDialogDiv\"></div>
<div id=\"AnotherDIV\"></div>

Object doesn\'t support this property or method

<script src=\"@Url.Content(\"~/Scripts/jquery-1.5.1.min.js\")\"
       type=\"text/javascript\"></script>
<script src=\"@Url.Content(\"~/Scripts/jquery.validate.min.js\")\" 
       type=\"text/javascript\"></script>
<script src=\"@Url.Content(\"~/Scripts/jquery.validate.unobtrusive.min.js\")\" 
       type=\"text/javascript\"></script>
<script src=\"@Url.Content(\"~/Scripts/jquery.unobtrusive-ajax.js\")\" 
       type=\"text/javascript\"></script>