Vaadin gantt add-on - can't by added to popup window

Flow
1

Hi,

I’m trying to use vaadin gantt add-on in my webapp, but I can add it only to my main window. :

mainWindow.setContent(diagram); works fine - diagram is displayed, but when I’m trying do something like that:

        
PopupWindow win = new PopupWindow();
win.setContent(diagram);
mainWindow.addWindow(win);

I can’t see any popup and when I run my app in debug mode I’ve got message like this:


JavaScriptException: (TypeError): Cannot read property „nodeType”: object is empty or undefined description: Cannot read property „nodeType”: object is empty or undefined number: -2146823281
JavaScriptException: (TypeError): Cannot read property „nodeType”: object is empty or undefined description: Cannot read property „nodeType”: object is empty or undefined number: -2146823281
JavaScriptException: (TypeError): Cannot read property „style”: object is empty or undefined description: Cannot read property „style”: object is empty or undefinednumber: -2146823281
JavaScriptException: (TypeError): Cannot read property „nodeType”: object is empty or undefined description: Cannot read property „nodeType”: object is empty or undefined number: -2146823281

diagram is just GanttDiagram configured just like in example source code.

Any idea what can I do to figured it out ?