US Patent 8140997 Manipulating display of multiple display objects

A method for manipulating display of multiple ordered and at least partially overlapping display objects on a display device includes: recording the current position in a stacking order of each of the multiple display objects in an object identifier table in association with a corresponding object identifier; changing the position in the stacking order of a first object in response to a first user action for selecting the first object; recording the position in the stacking order of the first object before the position is changed in the object identifier table as a previous position in the stacking order; and changing the position in the stacking order of the first object with the previous position in the stacking order of the first object in response to a second user action for restoring the changed position in the stacking order of the first object to the previous position in the stacking order.