It seems a form can not be attached to a view.
This will work.
var layout = new dhtmlXLayoutObject(document.body, '1C',"dhx_terrace");
var form = layout.cells("a").attachForm([
{type: 'fieldset', label: "Details:",width:450, list: [
]}]);
var grid = layout.cells("a").view("bb").attachGrid();
And this seems to have issues.
var layout = new dhtmlXLayoutObject(document.body, '1C',"dhx_terrace");
var form = layout.cells("a").view("bb").attachForm([
{type: 'fieldset', label: "Details:",width:450, list: [
]}]);
var grid = layout.cells("a").attachGrid();
When trying to run layout.cells(“a”).view(“bb”).setActive();