set panel's height every time in -openPanel
Also, adding graphics for the MacBook Pro Retina display.
Fixed a method that is deprecated in Mountain Lion to use the new method
make sure the popover is opening on the screen that has the menubar
The border is white like in Lion login panel.
The search panel did not want to be closed automatically when you click another icon in the menubar.
The search panel could not be opened on the first click.