Also made sure that it doesn't show up when PIE is active.
Popup content loads at the point where it is clicked instead of being pre-loaded.
[CL 2367322 by Matthew Griffin in Main branch]
Changed help button to fire on mouse down, so that the popup isn't triggered a frame after it's dismissed when you lift the mouse up.
[CL 2354414 by Matthew Griffin in Main branch]
Changed the SMenuAnchor to open the menu in the same window, as there was no way to specify whether the new window supports transparency and it doesn't need to extend out of the current window.
[CL 2353080 by Matthew Griffin in Main branch]
