How to get AccessControlUserf of Drawing?

Hello all,

I try to Get the AccessControlUsers of Drawing that I distributed ,but I always get all users of the Project ,Is that the bug or I did not get the right way ? below is my code:

Public Sub run3()





 Dim aa As Drawing

 



 

 Set aa = Application.Selection(1)

 Dim bb As AccessControlUser

 Dim str As String

 str = ""

 For Each bb In aa.AccessPermissions

    str = str & "|" & bb.Name

 Next bb

    MsgBox str

End Sub