Also important the note at the beginning of the doc, that explains "vSphere Client" and "vSphere Web Client", as not all functionalities are in both, it seems:
"
The instructions in this guide are specific primarily to the vSphere Client (an HTML5-based GUI). Most instructions also apply to the vSphere Web Client (a Flex-based GUI).
For the workflows that significantly differ between the two clients, there are duplicate procedures. The procedures indicate when they are intended exclusively for the vSphere Client or the vSphere Web Client.
"
In your case it seems you have to explicitly use vSphere Web Client (a Flex-based GUI)
Gianluca