Enable Skype icon on Unity notification panel on Ubuntu 13.04

Due to I switch back from Windows to Ubuntu. The most important program for me is "Skype". After I download installation from Skype official website it seems there is no problem at all I am able to installed in by Ubuntu Software Center. The problem  was occurring after I launch Skype and close the main window opens I expect it will be closed and shown the icon on notification panel area. But there is no icon on notification area then I launch Skype application again the windows instance comes up thus I try to log in again, suddenly I get an error message about another instance was already running.
After I search on google a bit I found that Ubuntu 13.04 was removed system tray whitelist feature from its unity. so I found this website to re-enable the whitelist by below instruction.

sudo add-apt-repository ppa:timekiller/unity-systrayfix
sudo apt-get update
sudo apt-get upgrade

After finished installation I do the following steps to add Skype to notification whitelist

Restart unity

ALT + F2 and enter "unity" or logout ubuntu to finish it

Checking if notification whitelist works by below command

gsettings get com.canonical.Unity.Panel systray-whitelist

You suppose to get something like below result comes out

['JavaEmbeddedFrame', 'Wine', 'Update-notifier']

Above result means you successfully install notification whitelist but the only applications was listed above are able to be shown in notification area. so we are going to append Skype in the list by editing in Dconf Editor.
 ['JavaEmbeddedFrame', 'Wine', 'Update-notifier']
Launch Dconf Editor and explore the configuration path to com.canonical.Unity.Panel and you will see the key "systray-whitelist". The default value would be "['JavaEmbeddedFrame', 'Wine', 'Update-notifier']" like we get it by the command line above. Then you append 'Skype' to the list as below picture.

systray-whitelist value in Dconf Editor

If you are command line lover you are able to use this command line

gsettings set com.canonical.Unity.Panel systray-whitelist "['JavaEmbeddedFrame', 'Wine', 'Update-notifier', 'Skype']"

Notice: Put the command line in one line because of blogger layout may split it to be display in 2 lines.

Final step is to logout and login Ubuntu.

TIPS: This instruction is not useful only Skype but also useful for another applications those are caused by similar issue.

For another Ubuntu version you can find out more by following the links below

http://askubuntu.com/questions/151112/how-do-i-get-the-skype-status-icon-back-on-panel-tray