1) Open sample project like WME demo
2) Expand any scene folder
3) Highlight scene file as shown:
http://main.jbw.pl/file/wme-dblclk1.jpg4) Then expand another scene folder:
http://main.jbw.pl/file/wme-dblclk2.jpg5) You can collapse recently expanded branch and return to the view 3)
So far, so good, so where's the trick?
You can repeat steps 4 & 5 continously without loosing focus from first selected file, but don't do it too fast.
On rapid expand/collapse PM recognizes your clicks as doubleclick and open selected file!
The fun is better if you have long dir and cannot see what is selected ;-)