Disabling popup menu items

[Monte Goulding]

>Actually I've taken to providing a blank line (no dash) for Windows to act
>as a separator and although it looks a bit odd at first, you get used to it
>rather quickly. So my code just traps for a blank line selection
>and doesn't
>change the menuHistory of the button (i.e. nothing happens). I would hope
>that RunRev would do something similar as it is odd to select a dash and
>have it show up in the option menu (how confusing for new users!).

In what cases is it necessary to have a separator in an option button?
Perhaps on this one the Windows HIG has it right?

Cheers

Monte