The trash has been introduced with Feng Office 1.1. It works like the trash on your computer desktop: If you delete an object, it is not permanently deleted right away but moved into the trash, from where it can be recovered (restored) if necessary.
PLEASE NOTE:
In Feng Office the trash is located in the workspace selector. Clicking on the correspondent entry will open the “Trash” tab that contains all deleted objects from the last 30 days.