FormView + LinqDataSource + FindControl()

I have a formview bound to a LinqDataSource.  The FormView is in InsertMode.  I am trying to change a control in the FormView in my Page_Load like so:

(FormView1.FindControl("tbVendorNumber") as TextBox).Text = "CHANGED";

This does NOT throw an exception.  It runs like everything is fine, but it does not change the textbox in question.  When I bind to an objectDataSource however, it works just fine.  

This ONLY happens when I'm in Insert mode.  When I change my InsertTemplate to EditItemTemplate, my controls change as they should.  Also, when I bind to an ObjectDataSource, the InsertTemplate responds like it should.

Can anyone tell me why being bound to a LinqDataSource is screwing up my ability to call myFormView.FindControl("") and modify the returned control.

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