Main panel has one button — a spade. When clicked Grave Robber will un-nest selected nests.
It is possible to abort un-nesting, for that press red button — a broken spade.
After un-nesting is done a tombstone will appear. When clicked Grave Robber will undo last un-nest.
Undo command remembers only the last un-nest command. If another un-nest will be performed undo will be overwritten.