This wraps the ObjectARX AcDbTextEditorStack class.

Public Structure TextEditorStack
  Public Enum StackType
    HorizontalStack
    DiagonalStack
    ToleranceStack
    DecimalStack
  End Enum
End Structure

public struct TextEditorStack {
  public enum StackType {
    HorizontalStack,
    DiagonalStack,
    ToleranceStack,
    DecimalStack
  }
}