The list of propagator functions - affecting forces that you want to model for orbit propagation.

Add	Adds a function to the collection.
Cut	Copies a propagator function to the clipboard and removes the propagator function from the list.
InsertCopy	Copies a propagator function and inserts the copy into the list.
Paste	Pastes a propagator function from the clipboard into the list.
Remove	Removes the specified function from the collection.
RemoveAll	Removes all functions from the collection.

Count	Returns the size of the collection.
Item	Allows you to iterate through the collection.