First, the basic operation is described in the Eclipse Help here!
Unfortunately, it does not work as described there!
Does anybody get it to work?
Please keep in mind that it may behave differently on different platforms; I am running Eclipse Mars on openSuSE 13.1/KDE 4.11.5, and this may be of course the reason why it will not work at all ... :-(
It worked fine for all previous versions of Eclipse I installed on that machine before.