references in math

[Bas Spitters]

Dear LyX-users,

I would like to do the following:
                (by 1)
        a         =     b.

Where 1 is a reference to formula 1 (with label one). 
It works if I use \stackrel{\ref{one}}{=}.
But I would like to use the built-in LyX reference (Insert -> Cross
reference).

Is it possible to do this?

Bas Spitters
(I am using LyX 1.1.6fix2)