Fixed item selection bug.

Improved state sync.

Auto hide on page when page is loaded and when the mouse is on the content area.

Usage made much easier by moving the popup content onto the left side of the page that is visible all the time and resizable, removable.

Default BIN folder for the deleted items, so they won't come back automatically later.

Folder creation, drag and drop, item ordering user interface greatly improved.

Design improvements.