You can detach an xref definition to remove the xrefs completely from your drawing. You can also erase the individual xref instances. Detaching the xref definition removes all dependent symbols associated with that xref. If all the instances of an xref are erased from the drawing, AutoCAD removes the xref definition the next time the drawing is opened.
To detach an xref, use the Detach method. You cannot detach a nested xref.
This example attaches an external reference and then detaches the external reference. This example uses the 3D House.dwg file found in the sample directory. If you do not have this image, or if it is located in a different directory, insert a valid path and file name for the PathName variable.
On Error GoTo ERRORHANDLER
' Define external reference to be inserted
Dim xrefHome As AcadBlock
Dim xrefInserted As AcadExternalReference
Dim insertionPnt(0 To 2) As Double
Dim PathName As String
insertionPnt(0) = 1
insertionPnt(1) = 1
insertionPnt(2) = 0
PathName = "c:/AutoCAD 2008/sample/3D House.dwg"
' Add the external reference
Set xrefInserted = ThisDrawing.ModelSpace. _
AttachExternalReference(PathName, "XREF_IMAGE", _
insertionPnt, 1, 1, 1, 0, False)
MsgBox "The external reference is attached."
' Detach the external reference definition
Dim name As String
name = xrefInserted.name
MsgBox "The external reference is detached."