I recently upgraded to vCenter 5. I want to add a new plug-in to vCenter. However, I do not have to option to add a plug-in. Specifically, I open the vCenter Plug-in Manager. I see Installed Plug-ins and Available Plug-ins. When I right-click in the Plug-in Manager window, the nearest plug-in is highlighted and I only have the choices to disable to copy to clipboard. How do I get the option to "Add plug-in"?
I am an administrator in vCenter at the server level. I do not have any conflicting (that I have seen) permissions further down the tree.