latex beamer preamble.

[Bo Peng]

Dear list,

I have a latex-beamer file that works well under lyx 1.3.6. When I
open the file using 1.4.0cvs, it can not be compiled. I notice that
compared to 1.3.6, the exported latex code has two additional lines:

\usepackage{usernames]{color}
\usepackage{graphicx}

I guess I need to change beamer.layout to 1.4.0 format/specification
but I can not find any info about it.

Cheers,
Bo