Custom UserControl with DataBinding, not returning value?

Question

Hi all, just a quick question. I have a custom control with a TextBox, Label and a ComboBox. All I want is to be able to select a binding source(for the TextBox) from the properties window when i use the control on a form. I have managed to get the controls Textbox to allow this using:

  <Bindable(True)>
  Public Property Code As String
    Get
      Return txtCode.Text.ToString
    End Get
    Set(value As String)
      txtCode.Text = value
    End Set
  End Property

 However, when i try to add a new record and save it, it is ruturning a null value.

Any help would be much appreciated.