[Resolved]Displaying item on datagrid?

[code]

I've been trying to add an item to my datagrid but when I add one it just displays a blank row. When I use msgbox to see the item text it shows the value I want to display. So my question is, why doesn't the datagrid display "test"?

Here's my vb:

Private Sub Window_Loaded(sender As System.Object, e As System.Windows.RoutedEventArgs) Handles MyBase.Loaded
	'add columns to datagrid
	Dim linkColumn As New DataGridTextColumn : Dim titleColumn As New DataGridTextColumn
	linkColumn.Header = "Links:" : titleColumn.Header = "Titles:"
	linkColumn.Width = DataGrid1.Width / 2 : titleColumn.Width = DataGrid1.Width / 2
	linkColumn.Binding = New System.Windows.Data.Binding("Links") : titleColumn.Binding = New System.Windows.Data.Binding("Titles")
	DataGrid1.Columns.Add(linkColumn) : DataGrid1.Columns.Add(titleColumn)

	mainTimer.Interval = 5000 : mainTimer.Enabled = True

	DataGrid1.Items.Add("test")
	MsgBox(DataGrid1.Items.Item(0).ToString) 'although the datagrid won't show it, this displays "test". why?
End Sub

Not sure if it's needed to help me but here's my XAML:

<DataGrid AutoGenerateColumns="False" Height="289" HorizontalAlignment="Left" Margin="10,10,0,0" Name="DataGrid1" VerticalAlignment="Top" Width="481" Grid.ColumnSpan="2" ItemsSource="{Binding}" />