Use a dropdown as content for a dropdown item

Hi!
I’m trying to use multiple dropdown menus “in cascade”, but the plugin not render it well….

For example:

[dropdown]
 [dropdown-option]Select one…[/dropdown-option]
 [dropdown-option value=”option1″]First option[/dropdown-option]
 [dropdown-option value=”option2″]Second Option[/dropdown-option]
[/dropdown]

[dropdown-content value=”option1″]
 [dropdown]
  [dropdown-option]Select one…[/dropdown-option]
  [dropdown-option value=”option11″]First option[/dropdown-option]
  [dropdown-option value=”option21″]Second Option[/dropdown-option]
 [/dropdown]
 [dropdown-content value=”option11″]Content for the first option.[/dropdown-content]
 [dropdown-content value=”option21″]Content for the second option.[/dropdown-content]
[/dropdown-content]

[dropdown-content value=”option2″]Content for the second option.[/dropdown-content]

There is a way to use it?
Thanks!