Delete it, it's gone forever ?!?

I'm liking Check Off so far... a little rough around the edges but on it's way. I came across a functionality issue: After creating a long list of activities, broken out into several submenus and sub-submenus, I accidentally deleted the main parent ( I have a sensitive touchpad ). Unfortunately there seemed no way to undo the action... ⌘-Z didn't work, <esc> didn't work. I eventually had to restore the pfile using Time Machine and redo some of my work.

Was this "stupid user" error, a bug in the program, or a missing feature?</esc>