equation arrays

[Ilya Soifer]

Hi, 
I am trying to create an array of three equations of the form
A = B+C
 
I want it to be a 3x3 array (so that A's are aligned '=''s are aligned
and B+C's are aligned. 
In Lyx 1.3 it was sufficient to write A=B+C and then to Ctrl-ENTER
somewhere in the middle of the formula to get such an array
LyX 1.4 by default generates an array of two columns. 
Does anyone know how to get the behaviour of LyX 1.3?
Thanks
Ilya