AutoCAD .NET :: Creating Mtext Object With Annotative TextStyle

I am trying to create a Mtext object with an annotative TextStyle.  I make the textstyle current (which I don't know if is exactly the same as changing the TextStyleId of the mtext object) and create the MText.  The problem which I encounter is that the newly crated MText Object has textheight as the textstyle's paper space text height, instead of scaling the text height by the annotative scale, as when you create the Mtext using Autocad menu.