[Zope] How to Delegate manage users permission to another role?

[Ping Lau]

Hi,

I have installed UserDB product & successfully
created/changed/deleted users in DTML method.  My goal
is to create a role called Admin & let users with
Admin role to create/change/delete other users.  So I
created Admin role & user Test assigned to this role. 
In the Security Tab of the folder containing the
acl_user folder, I assigned Manage Users Permission to
Admin.  Next I login as Test & tried to add a new
user.  But Zope authorization window appeared.  I
tried to login as Test a couple times & Zope gave me
the authorization error! What did I do wrong?

Regards,
Ping

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