With device connected, Bluetooth indicator won't grey out when disabled by the wireless key

Test case:
1. Pair a Bluetooth device to the system
2. Press the wireless key to disable the Bluetooth
3. When it's disabled, check the Bluetooth icon

Expected result:
* Bluetooth disabled, the indicator grey out

Actual result:
* Although the Bluetooth has been disabled, but the indicator looks like the Bluetooth is still at the ON state

Please find the attachment for the screenshot

ProblemType: Bug
DistroRelease: Ubuntu 14.04
Package: indicator-bluetooth 0.0.6+14.04.20140207-0ubuntu2
ProcVersionSignature: Ubuntu 3.13.0-48.80-generic 3.13.11-ckt16
Uname: Linux 3.13.0-48-generic x86_64
ApportVersion: 2.14.1-0ubuntu3.7
Architecture: amd64
CurrentDesktop: Unity
Date: Tue Mar 24 23:32:07 2015
InstallationDate: Installed on 2015-03-24 (0 days ago)
InstallationMedia: Ubuntu 14.04.1 LTS "Trusty Tahr" - Release amd64 (20140722.2)
SourcePackage: indicator-bluetooth
UpgradeStatus: No upgrade log present (probably fresh install)