GDM show Session Choice when login witpassword-locked-user

[Kamin Punpipat]

I have two Display Manager : 1.lightdm 2.gdm
I have two users : 1.Administrator 2.Public
I can select session to login when I login user that have password only
Ex.
I goto Administrator (Password Need)
and show password box with session choice
But when goto to Public (No password) there no way to select session choice
I click "not listed" and GDM display users box but no session choice also

Lightdm have Session Choice also

ProblemType: Bug
DistroRelease: Ubuntu 13.10
Package: gdm 3.8.4-0ubuntu2
ProcVersionSignature: Ubuntu 3.11.0-15.23-generic 3.11.10
Uname: Linux 3.11.0-15-generic x86_64
ApportVersion: 2.12.5-0ubuntu2.2
Architecture: amd64
Date: Sun Jan 12 12:07:37 2014
InstallationDate: Installed on 2014-01-08 (3 days ago)
InstallationMedia: Ubuntu 13.10 "Saucy Salamander" - Release amd64 (20131016.1)
MarkForUpload: True
SourcePackage: gdm
UpgradeStatus: No upgrade log present (probably fresh install)

[Kamin Punpipat (kaminpattanasin)]

Is not bug, but it about applications design. If this it really bug change this status. But not leave as Invalid or cancel this bug.