KDE Network Manager is suppose to have notification options for Connection Activated or Deactivated are missing here. I am on Kubuntu 14.04 LTS fully updated. You can see in the picture that some of the items are missing.
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Different version of the KDE Network Manager widget have various number of the notifications.
Kubuntu 12.04 LTS - KDE 4.8 has:
Kubuntu 14.04 LTS - KDE 4.13 has:
Kubuntu 15.04 - KF5 / plasma 5 has:
With the 14.04 LTS, KDE 4.13,the Connection Activated' or 'Deactivated' are shown by the 'Active connection state changed'.