Why Do I Get An UAC Prompt When I Start Task Manager From The Desktop?

[AWS]

Windows 8 Pro X64
In Windows 7 Ultimate x64 if I start Task Manager by right clicking on the taskbar and selecting it it starts without any UAC prompt running in my security context. It is only if I click on show processes from all users that I get an UAC prompt for an administrator password.
In Windows 8 Pro x64 I get the UAC prompt when I start Task Manager by right clicking on the taskbar in the Desktop environment. Why?
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