Solution
With the release of Multisim 11.0, the same NI ELVIS instruments that can be accessed in Multisim Education and Student editions can also be activated in the Professional editions (Power Pro and Full).
In order to activate these devices, install the most current NI-ELVISmx driver software. The ELVISmx instruments will be activated in Multisim, and available in the Instruments toolbar.
You can also access the same instruments under the Simulate»Instruments»NI-ELVISmx Instruments menu.