Question Problem with Sortedlist and Settings File

[dna]

Hi,
I've a problem that I can't solve. Here it is:
Using Visual Studio 2008 SP1, Windows 7 Ultimate.
I'm filling one SortedList with Objects (Buttons), I've created one Settings file called Settings1, and added "Name" - "AddedControls", for "Type" I choose "System.Collections.SortedList", the "Scope" is "User".
Here is the code for filling the SortedList:

Private Sub pnlWorkSpace_DragDrop1(ByVal sender As Object, ByVal e As DragEventArgs) Handles pnlWorkSpace.DragDrop
       Dim dropX As Single = e.X
       Dim dropY As Single = e.Y

       Dim NewButton As New Button
       NewButton = CType(Me.mCurrentObject, Button)
       NewButton.Text = "Added"
       Me.Controls.Add(NewButton)
       pbWorkspace.SendToBack()
       pnlWorkSpace.SendToBack()
       Dim dropLocation = New Point(dropX - NewButton.Size.Width \ 2, dropY - NewButton.Size.Height \ 2)
       Dim dropPoint As New Point()
       dropPoint = Me.PointToClient(dropLocation)
       NewButton.Location = dropPoint
       mObjectCollection.Add(NewButton.TabIndex, NewButton)
       AddHandler NewButton.MouseDown, AddressOf NewButton_MouseDown

   End Sub

The code for adding the SortedList in the Settings1 file is:

Private Sub btnSave_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles btnSave.Click
        Settings1.Default.AddedControls = mObjectCollection
        Settings1.Default.Save()
   End Sub

When I run the application, I fill the form with some buttons, then I pres the "Save" button and it appears that the "mObjectCollection" is transfered in "Settings1.Default.AddedControls", but when I stop the application and run it again the "Settings1.Default.AddedControls" has value "Nothing".

Can anyone explain why that happens and what am I doing wrong.

I've tried step by step mode in line "Settings1.Default.Save()", and when the pointer passed trough,I've looked at my projects folder where the Settings1.settings file is situated, and the "Date modified" option did not changed. I'm confused

Thank You in advance,
Julian