AutoCAD .NET :: Adjusting Appearance Of Leader Drawn

Using some slightly modified code from the samples provided by Autodesk as shown below I'm attempting to draw a simple leader with MText annotation.

In the attached bitmap the top leader shows the result of running the code and the bottom one the appearance I want which is obtained by changing the AutoCAD properties of the leader under

Text
Text pos vert
from 'Above' to 'Centered'

I can't identify anything in the API which allows me to draw with this change, but feel it should be there. Searching the web for code to draw leaders, basically only returns minor variations on this code with only the same functionality.

<CommandMethod("TDD")> _ Public Sub TestDrawLeader()DrawLeader("Here it is", New Point3d(0, 0, 0), New Point3d(15, 5, 0)) End Sub ' AddLeaderAnnotation ''' <summary> ''' Called from: AddLeaderAnnotation ''' </summary> ''' <returns></returns> ''' <remarks></remarks> Function DrawLeader(ByVal spText As String, ByVal pPtStart As Point3d, ByVal pPtEnd As Point3d) As BooleanDim acDoc As Document.
[code]....