Not able to implement ObjectDataProvider in WPF Application

Class MyIntIsHere
 Dim a As Integer

 Public Property myA() as Integer
  Get
     Return a
  End Get
  Set(ByVal value as String)
     a=value
  End Set
 End Property

 Public Sub New(_a as Integer)
  a=_a
 End sub

End Class

Class DisplayIt
 Private lst As New List(of MyIntIsHere)

 Public Sub New()

 End Sub

 Public Function ShowIt() as List(of MyIntIsHere)
  lst.Add(new MyIntIsHere(1))
  return lst
 End Function

End Class

<Window.Resources>
 <ObjectDataProvider x:key="MyProvider" ObjectType="{x:Type local:DisplayIt}" MethodName="ShowIt"/>
</Window.Resources>
Now i want to display it in a ListBox :
<ListBox ItemsSource="{Binding Source={StaticResource MyProvider}}" and other things >
<ListBox.ItemTemplate>
 <DataTemplate>
  <TextBlock Text="{Binding Path=myA}"/>
 </DataTemplare>
</ListBox.ItemTemplate>
</ListBox>