How do i Add a menu separator?

How do i Add a menu separator? Or group menu items together and spearate them from other menu items using a solid line.

I am creating a addin for MS Word.I have been able to add the desired menu items in the menubar of the Commandbar.The problem is that i am not able to add a menu item separator.
I need help urgently and Thanks for any help.

[Bonker Gudd]

Try a Caption of "-" in the Menu Editor, you still have to have a Name.

Thanks, but this is not what i want.
I am not adding a menu to a VB form.I am creating a menu item to the Word menu bar thru a Addin developed in VB.
Once i add the new menu items to the word addin, i need to group them using a bold line which i am unable to do.