vCenter 5.1 Web Client – where is Update Manager?

I am running vCenter Server 5.1 build # 947673.  This is a small virtual structure with less than 10 VMs. 

The web client software is installed on the same VM as vCenter Server. 

I installed Update Manager on the vCenter Server.  When I log into the web client via FireFox as an administrator, I do not see the Update Manager tab under the Monitor Tab. 

I have administrator privileges. 

The strange thing is, using the traditional vSphere Client to connect to vCenter, I have loaded the Update Manager plugin and downloaded the latest patches. 

However, I do not see Update Manager in the 5.1 web client.  Am I missing something?

See attached screen.  Is where the red arrow is shown the area I should see Update Manager tab?

thanks