Add external Dojo component in worklight [script error on require dojo Dgrid ]

I have downloaded Dgrid and, after renaming a folder in dgrid, i move it in Dojo folder.

In html include this code:

<!--application UI goes here-->
<script type="text/javascript" src="dgrid/Grid.js"></script><!--prova importazione Dgrid-->
<script src="js/initOptions.js"></script>
<script src="js/MobileACG.js"></script>

set this in build_dojo.xml

<include name="dgrid/Grid.js" /> <!-- prova dGrid-->

and the error is here (in js), when read the row require..

function creaGridTableArticoli(){
    dgrid
    require(["dgrid/Grid"], function(Grid){
        var columns = {
            first: {
                label: "First Name"
            },
            last: {
                label: "Last Name"
            }
        };
        var grid = new Grid({ /* options here */ }, "grid");
        WL.Logger.debug("ok");

    });

}