Embedding asymptote in Lyx

[Cyril]

Hello everybody,

I'm trying to embed asymptote code in my LyX files.
The compilation of a file containing asymptote code named "myfile.tex" 
works like this:

latex myfile.tex
asy myfile-*
latex myfile.tex

How can i manage to get this sequence of instructions with a simple 
shortcut inside LyX ?

Thank you for your answers,

Cyril