Damn! How to set image in a landscape mode into Lyx.

Ok. Finally i've discovered the magic formula to set a image in landscape mode into lyx, with custom margin.

The ingredients are these: 

1. Modify Document preamble: go to Document->Settings->LaTextPreamble and add: 
   \usepackage{pdflscape}
   \usepackage{changepage}
   \usepackage{anysize}
2. Before you insert the image, add a LaText box code (or hit CTRL+L) and insert: \marginsize{3cm}{2cm}{0cm}{1cm} % left rigth top bottom
   \begin{landscape}
3.  Add Image (Insert->Image or Insert ->Floating Object and after, Insert->Image).
4. Set image size: mouse right click on image and select Settings.
5. After Image add another  LaText box code and insert: \end{landscape}
6. Optionally: if you want change margin, add another time  \marginsize{3cm}{2cm}{0cm}{1cm} % left rigth top bottom with your preffered values.

This is the result: