Hi Pilou and everyone again.

I tried the FatLines command and all works fine for me.

The UI add on i wrote, needs to have the commands and scripts, contained in the file Step5_Commands_And_Scripts.zip.

One unzipped, you will get 2 elements.

1 folder "commands" and 1 folder "scripts"

Both the folders must be copied into the folder : "<moi install folder>".

In the "commands" folder, for example, there are the FatLines.htm and FatLines.js files, that are required to run the FatLines command.

Note that in my package the command file name is "FatLines" and not "_FatLines".

Hoping this con help.

Marco.