una/studio/template/designer.html

__content__
<script defer type="text/javascript">
	var __js_object__ = new BxDolStudioDesigner({
	    sActionUrl: '<bx_url_studio />designer.php',
	    sLogoPreviewId: '__logo_preview_id__'
	});
    $(document).ready (function () {
        var e = CodeMirror.fromTextArea($('textarea[name=code]').get(0), {
            lineNumbers: true,
            mode: "htmlmixed"
        });
    });
</script>