There is a way to access the menu button for the remote on the WD TV! What you will want to do is use the options button the the WD remote to pull up the on screen remote keys. Within the options that come up there will be one called "MISC" click on that. Then at the bottom of the TV you should see more quick buttons come up. The options that you will want to try is the power on/off or menu.
Here are some links with pictures so you can see what I am describing:
Hope this helps!
The Sling Moderation Team