public PlanTopology this[
	Level level
] { get; }

Public ReadOnly Property PlanTopology ( _
	level As Level _
) As PlanTopology
	Get

public:
property PlanTopology^ PlanTopology[Level^ level] {
	PlanTopology^ get (Level^ level);
}

Accessing plan topology requires that document is modifiable as it will actually trigger calculating plan topology if they have not been calculated yet. The time necessary for the calculations may be significant and should be considered.