<!-- declarative -->
             <form data-dojo-type="esrith/amos/form/FormValidator" data-dojo-props="afterSubmit: ${_formAfterSubmit}">
             </form>

     // programetic
             this.frmValidator = new FormValidator({
                 afterSubmit: lang.hitch(this, "_formAfterSubmit")
             }).placeAt(this.domNode);
             this.frmValidator.submit();

     _formAfterSubmit: function (objResponse) {
                 //to receive response after FormValidator send value to server.
             }

     <!-- declarative -->
             <form data-dojo-type="esrith/amos/form/FormValidator" data-dojo-props="beforeSubmit: ${_formBeforeSubmit}">
             </form>

     // programetic
             this.frmValidator = new FormValidator({
                 beforeSubmit: lang.hitch(this, "_formBeforeSubmit")
             }).placeAt(this.domNode);
             this.frmValidator.submit();

     // when call "submit()"
             _formBeforeSubmit: function (objValue) {
                 //to modify value or do something before FormValidator send value to server.
        
                 //and return new value.
                 return objValue;
             }