Set up Enable Rule in CRM Visual Ribbon Editor
===

I'm using the CRM Visual Ribbon Editor to create a custom button which sends all selected emails.  However, since Email is an Activity entity, other activities could be in the user's selection when pressing the button.


Is there is an enable rule that specefies that all selected items are Emails?

If so, how do I use it?

If not, could a custom rule written in JScript work?


Thanks for any help!