Steps to reproduce:
1) Open the attached EJB Module Project (EJB Module) in Project explorer
2) In the source packages node open the "NewSessionBean.java" java bean
3) Open the "NewSessionBean.java" on the the editor and right click and select "Insert Code" action
4) From "Insert Code" action pop-up select "Add Business Method"
5) The "Add Business Method" dialog pops up and enter a name and give a return type to the method and Add parameters or
exceptions if required or omit.
6) On the bottom of the  "Add Business Method" dialog their is an option named "Use in Interface" with three options
namely "Local","Remote" and "Both" but here all the three options(radio buttons) are disabled and so cannot add the new 
method to an interface as well as due to that the "ok" button is also disabled.But the UI displays a error label with
"At least one interface must be selected"

The "Use in Interface" with three options gets disabled when you create a new bean with one interface such as the
attached project. But if you create another bean including both types of interfaces this problem doesn't occur.

Dev Build 200808170243
JDK 6 Update 10
Glassfish V2 Server