linqdatasource doesn't show user control label in where clause menu...

Hi all, I am trying to configure a LinqDataSource control.
On my page I have a user control which has a label in it that stores/displays the person's username. It user control looks like this:

Partial Class Controls_UserName     Inherits System.Web.UI.UserControl     Public Sub Page_Load(ByVal sender As Object, ByVal e As System.EventArgs) Handles Me.Load

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