Indicate how to remove a plane (or list of planes, previously         
selected with Plane->Select, when 
Global is pressed).
Scope
When the 
Scope is 
All, the plane and all 
its contents is removed. This is the default.
When the 
Scope is 
Container, the plane is removed but
its contents (directions, atoms, bonds, orbitals, texts) is saved, 
linked to the plane parent. 
When the 
Scope is 
Contents, the plane is preserved but 
all its contents (directions, atoms, bonds, orbitals, texts) is removed. 
Atomic planes are removed because they cannot live without the defining
atoms.
When the 
Scope is 
direction, 
atom, 
bond, 
orbital or 
text, these objects are removed from the plane.
When an atom used to define an atomic plane is removed, the plane is 
automatically removed.
When the removed plane included the current object,
the current layer becomes the new current object.
Clicking the mouse over a plane in the current layer, its identification 
is transported to the dialog and 
Ok is automatically pressed.
To recover the previous state press 
Undo.