Impersonation info via AMO - not copied when cloning SSAS DB ?

Hi there,

I have SSAS DB which has Impersonation info set to specific Windows user name and password.

I have AMO script in SSIS, which clone DB to another with different name, update structure with full expand and when I try to process new DB it fails with error "The name provided is not a properly formed account name....."

When i check it in SSMS I see, that impersonation mode is set to correct user but without password. When I set password manually in SSMS, then I am able to process new DB from AMO script.

Could you please let me know how to set with AMO also impersonation mode to USER and PASSWORD ?

Here is my code

Public Sub Main()
        Dim Connection As ConnectionManager
        Dim Server As New Server
        Connection = Dts.Connections("SSAS")
        Server.Connect(Connection.ConnectionString)
	'Clone existing DB CUBE
	Dim OldDB As Database = Server.Databases.FindByName("CUBE")
        Dim NewDB As Database = OldDB.Clone()
        NewDB.Name = "CUBE_merging"
        NewDB.ID = "CUBE_merging"
        Server.Databases.Add(NewDB)
        NewDB.Update(UpdateOptions.ExpandFull)
	NewDB.Process(ProcessType.ProcessFull) '!!!!!!!! processing not working
        Server.Disconnect()
        Dts.TaskResult = ScriptResults.Success
    End Sub