Table Profile Provider

I'm trying to combine the table profile provider (http://www.asp.net/downloads/sandbox/table-profile-provider-samples/) with the create user control.  I have code similar to on this post (http://forums.asp.net/t/967712.aspx) : 

void CreateUserWizard1_CreatedUser(object sender, EventArgs e)
{

    //Create an empty Profile for the newly created user
    p = (ProfileCommon)ProfileCommon.Create(CreateUserWizard1.UserName, true);
   
    //Populate some Profile properties off of the create user wizard
    //The container syntax is used to get a reference to some controls that I added to a templated
    //version of the create user step
    p.FirstName = ((TextBox)CreateUserWizard1.CreateUs ...