Subtitle Edit - compare subs

[maudit]

Hi, few weeks ago while using Subtitle Edit I was able to visualize two different language subtitle in the same video window.
But I do not remember how to do it..
I'm sure it is possible but I've forgotten the procedure...
any help?

edit: nevermind, sry, I got it, I first drag a video into the sub window and select a language,
then I rightclick on the little green arrow icon in the taskbar and choose another.