Getting A Reference To A Script Task In VB.net

I am trying to get a reference to a script task so I can manipulate it's properties. However I can't seem to figure it out? I have a reference to Microsoft.SqlServer.ManagedDTS and Microsoft.SqlServer.Dts.Design and based on BOL they show

Imports System

Imports System.Collections.Generic

Imports System.Text

Imports Microsoft.SqlServer.Dts.Runtime

Imports Microsoft.SqlServer.Dts.Tasks.BulkInsertTask

Imports Microsoft.SqlServer.Dts.Tasks.FileSystemTask

Imports Microsoft.SqlServer.Dts.Runtime

But I get errors saying

Imports Microsoft.SqlServer.Dts.Tasks.BulkInsertTask

Imports Microsoft.SqlServer.Dts.Tasks.FileSystemTask

can't be found? What do I need to reference or Import to be able to see the Tasks and/or Task types so I can convet InnerObject to a ScriptTask type and manipulate?

What am doing wrong?????

Dim pkgPath As String = "C:Program Files\ETLODSPolicy"Dim pkgName As String = "LoadOdsCountryCodes"

Dim pkg1 As String = pkgPath + pkgName + ".dtsx"

Dim pkg2 As String = pkgPath + pkgName + "2.dtsx"

Dim app As Application = New Application()

Dim pkg As Package = app.LoadPackage(pkg1, Nothing)

Dim x As Executable

For Each x In pkg.Executables

Dim t As TaskHost = CType(x, TaskHost)

If t.Name = "SCT Set Global Variables" Then

Dim sct As ???? = ctype(t.InnerObject,????)

End If

Next