Hi Pilou,
you need to create a new module. (you can use "select" module as template)
copy "07 Select.htm" to "60 LineWeb.htm"
open 60 LineWeb.htm with notepad

<moi:Spacer/>
<moi:CommandButton icon=" ----- put BASE64 icon here ---- " onbuttonclick="LineWeb">LineWeb</moi:CommandButton>