LyX style for command with multiple arguments

I would like to create a style for a command that takes multiple arguments:

\classify{A}{B}{C}

I started creating a style

Style Classify    Category   FrontMatter    LatexType  Command    LatexName  classifyEnd

but this kind of style works only for commands that take a single argument. How can I modify the style definition so that it accepts multiple arguments and optional arguments?