var form = serverWidget.createForm({	
                title: 'File Upload'
            });
    	    var field = form.addField({
                id: 'custpage_upload_file',
                type: serverWidget.FieldType.FILE,
                label: 'Upload'
            });
            field.layoutType = serverWidget.FieldLayoutType.NORMAL;    	    
            form.addSubmitButton({
                label: 'Submit Button'
            });
            context.response.writePage(form);