"I am unable to add dimensions or select edges from the cylindrical face in the drawing sheet view while using C#. I have tried using the GetVisibleEntities2 method with the swViewEntityType_SilhouetteEdge flag, but the result (swEntities) is null. Despite this, the edges of the cylindrical face are visible in the drawing view. Can you help me identify why the edges are not being retrieved via the API, even though they are visible in the view?"