Showing neighbors in topology page, Mote 2 is set as DAGroot and Wireshark debug is enabled by default.

Now when you mouover  on a mote, its neighbors are shown as well as its route path. 

In simulatorMode, wireshark debug is enabled by default, and Mote 2 is
set as DAGroot. I choosed Mote 2 (instead of Mote 1) in order to have a
more complex network in linear topology!
could you please check your indentaton? In particular, please don't introduce any tabs anywhere. We use 4 spaces indentation everywhere.