Using an ObservableCollection

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VB

WPF

LINQ

Hi

I have been searching fo days now to resolve a binding issue i am having and every solution i found has come up short and not worked. All i can think of is that what i am trying to do is not supported and cannot be done (But I Doubt it.) Here is the scenario.....

I have a class called SupportCall
Within the class there is an ObservableCollection of a SupportAction object.
Based on the security rights of the user viewing the support call they can see All SupportAction's or just public ones. i expose the lists By having two properties as shown below.

Public ReadOnly Property Actions() As IList(Of SupportAction)
 Get
  Try

      Dim found As IQueryable(Of SupportAction) = Nothing
      found = From a As SupportAction In _actions.AsQueryable _
              Order By a.CreateDate Descending
      Return found.ToObservableCollection

   Catch ex As Exception
      Throw ex
   End Try
  End Get
 End Property

And....

Public ReadOnly Property ActionsGeneral() As IList(Of SupportAction)
 Get
   Try

      Dim found As IQueryable(Of SupportAction) = Nothing
      found = From a As SupportAction In _actions.AsQueryable _
      Where a.IsInternal = False Order By a.CreateDate Descending
      Return found.ToObservableCollection

   Catch ex As Exception
       Throw ex
    End Try
 End Get
End Property

i use an extention fucntion to convert the IQueryable to an ObservableCollection. The function is below.....

<Extension()> _
Public Function ToObservableCollection(Of T)(ByVal MyCollection As IEnumerable(Of T)) As ObservableCollection(Of T)
  Try

    Dim c As New ObservableCollection(Of T)(MyCollection)
    Return c

   Catch ex As Exception
     Throw New NotSupportedException(ex.InnerException.Message)
   End Try

End Function

In my front end WPF application i use one of the properties to populate a datagrid like so....

dgActions.ItemsSource = _CurrentCall.Actions

i have a button that then adds a new action. This is done via a method within the SupportCall Object. The method is below....

Public Sub AddAction(ByVal UserID As Integer, ByVal Description As String, ByVal HasAtt As Boolean, ByVal AttFileName As String, ByVal Type As Integer, ByVal Internal As Boolean)
           Try
               Dim sa As New SupportAction(_callid, UserID, Description, HasAtt, AttFileName, Type, Internal, _datasource, _DSusername, _DSPassword)
               _actions.Add(sa)
               NotifyPropertyChanged("Actions")
               NotifyPropertyChanged("ActionsGeneral")
           Catch ex As Exception
               Throw ex
           End Try
       End Sub

my problem is that when i fire the AddAction sub i expect the WPF datagrid to reflect the change as its source has been set to be an ObservableCollection. Unfortunatley nothing happens. I have to close the form and reload the view the new action in the grid. I need to be able to bind the Datagrid.ItemSource dynamically in code rather than XAML to apply user security features. Can anyone tell me what the hell i am doing wrong here because i just cant get it to work.... Please Help Someone......