Enterprise Manager

Hello all. I'm looking to grant users the ability to manage OEM metric extensions [http://docs.oracle.com/cd/E24628_01/doc.121/e24473/metric_extension.htm] without giving them super-administrator access. They're currently under roles setup with:
ROLES:
- EM_USER
- PUBLIC
TARGET PRIVILEGES:
- connect to any viewable target
- view any target

I tried setting up a METRIC_ADMINISTRATOR role:
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setup -> security -> roles

step 1 of 6 - properties
click CREATE button
name: Metric adminstrator
description: create, manage, edit all metric extensions.
click next

step 2 of 6 - Roles:
click next

step 3 of 6 - target privileges:
+ (##picks all HOSTS)+
under target privileges, click 'add'
SEARCH AND ADD TARGETS POPUP:
Target Type = Host
select all the hosts I see
click SELECT

+ (## Add the ability to manage metrics for the hosts I just selected)+
back at the target privileges section, click "Grant to All" button
TARGET PRIVILEGES SCREEN:
select 'manage target metrics' row
click continue

back at the target privileges section:
click NEXT

step 4 of 6: EM RESOURCE PRIVILEGES
select metric extensions row --> click pencil
create metric extension ON
CONTINUE
NEXT

step 5 of 6: ADMINISTRATORS
click NEXT

step 6 of 6: review
click FINISH
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After the above steps, it looks like the person granted this role SHOULD be able to create metric extensions. however, the user was not able to actually 'edit' his own metric extension. is anybody familiar with this process able to shed some light on this? have i added enough privs for the user?