I want to get a direction of texts in annotations.

I found that annotations have "DisplayData", and "DisplayData" has text angle from X axis.

But I can't find how to get X axis.

I tried IAnnotation::GetPlane.

I can get correct X axis in some annotations , but I got wrong one in others.

(Some annotations return just XY plane.)

I also tried IAnnotationView::GetViewRotation.

I can get correct normal vector of annotations , but I got wrong X axis in some annotations.

How can I get X axis in annotations(or direction of texts in annotations)?