Optional arguments for a custom InsetLayout?

[Florian Rubach]

I was trying to write a really small module for the sidenotes package. I 
pretty much copied what jürgen Spitzmüller wrote for the pdfcomment 
package (http://wiki.lyx.org/uploads/Modules/pdfcomment.module)

Now what I realized is, that I can't insert optional arguments (the LyX 
way, via insert>short title), even though I specified their availability 
in the module. The pdfcomment module also seems to enable optional 
arguments, but I can't add any when I try it.

Does anyone know what I am doing wrong or if this is a bug? The code for 
the module is below.

Thanks for your help!

#\DeclareLyXModule{Sidenotes}
#DescriptionBegin
#Inserts sidenotes in the output.
#DescriptionEnd
# Author: Florian Rubach

Format 11

InsetLayout sidenote
    LyXType               custom
    LabelString           "Sidenote"
    LatexType             command
    LatexName             sidenote
    Decoration            classic
    LabelFont
      Color               cyan
      Size                Small
    EndFont
    MultiPar              false
    OptionalArgs          2
    Preamble
        \RequirePackage{sidenotes}
    EndPreamble
End