Please download the latest release from here instead:
The latest change set however can be downloaded here:
Stable Release Version 1.5
-Browser boundary detection.
-Fixed a bug where PopupMenuItems containing a child menu remained selected even when not hovered.
-Fixed a bug where some menus were oversized when showing up for the first time.
-Fixed a bug that caused a parent menu to close even when its child menu was still open.
-Renamed the 'Title' property in the PopupMenuItem class to 'Header'
-Placed the PopupMenu and the PopupMenuItem classes into seperate files.