Gets a subtextpart's outermost subtextpart. This is a top-level subtextpart with a nested level of 1. The property's value is an object of the type SubTextPart or null if this subtextpart is already a top-level subtextpart.
public SubTextPart OuterMostSubTextPart { get; }
Public ReadOnly Property OuterMostSubTextPart() As SubTextPart
Read only.