java - How to open a sub window with a simple Link -

i want open vaadin sub window simple link. thing link accepts url, not window-object. there way following code work?

verticallayout todolist = new verticallayout(); todolist.setspacing(true); todolist.setmargin(true); todolist.setsizefull(); todolist.setsizeundefined();  // ...   window mywindow = new window("my dialog"); mywindow.setpositionx(200); mywindow.setpositiony(100);  todolist.addcomponent(todotable); link link = new link("click me!", new externalresource(mywindow)); todolist.addcomponent(link); 

do way:

todolist.addcomponent(todotable); button link = new button("click me!"); todolist.addcomponent(link); link.addclicklistener(clicklistener()   {       onclick()       {           window mywindow = new window("my dialog");           mywindow.setpositionx(200);           mywindow.setpositiony(100);           mainwindow.addwindow(mywindow);       }    }); 

from here:

https://vaadin.com/book/vaadin7/-/page/layout.sub-window.html

if wish open real browser window (not sub window) here:

https://vaadin.com/book/vaadin7/-/page/advanced.html

it depends if new window should part of vaadin app or other content or independent vaadin app instance.