Recreating measure created in Finale 2012 using line from palette

I'm trying to create in Musescore 1.3 (version 5702) the following measure:

http://www.siralan.org/musescore/finale.png

and the line defining the triplet doesn't redefine the length of the two notes in it. What I've been able to create is

http://www.siralan.org/musescore/musescore.png

and I haven't found a way to recreate the measure as created by Finale 2012.

(Measure is from "Do To Me" by Trombone Shorty, baritone sax part)

Mike Squires