2D drawing to a 3D View will always be placed on the default drawing plane. If no default drawing plane has been set, the first valid plane in the view is used as the default drawing plane.

public void IGetDefPlane(
	ref string str1
)

Public Sub IGetDefPlane ( 
	ByRef str1 As String
)

public:
void IGetDefPlane(
	String^% str1
)

member IGetDefPlane : 
        str1 : string byref -> unit