aligned displaystyle equations inside itemize environment

[Jonne Zutt]

Hi all,

Does anyone know the right way to align displaystyle equations mixed with
the itemize environment in LyX?

Example:

* first function
        P_1 &= \sum_a\inA displaystyle
* but another one
        P_2 &= blabla
* or perhaps
        P_3 &= blabla

I want to align the '=', or left align the equations...

Thanks in advance,
Jonne.