1) Start SB 2
2) Drop a TableView
3) Select TableColumn C1
4) In Layout section, change C1.prefWidth from 75 to 80
     => don't press ENTER
5) Select TableColumn C2
     => C2.prefWidth is 80
     => BUG : C2 prefWidth should be 75
6) Select TableColumn C1
     => C1.prefWidth is still 75
     => BUG : C1.prefWidth should be 80
7) Select TableColumn C2
     => C2.prefWidth is 80
     => BUG : C2.prefWidth should be 75