Populate a text box in CreateUserWizard

I have the following CreateUserWizard control that has 3 steps in it.
Step 1: WizardStepLoginName
Step 2: WizardStep2
Step 3: CreateUserWizardStep1


In step 1, the user will check to see if the username is available.  If so, when the control gets to Step3, I want to have the text that is in the WizardStepLoginName txtLogin textbox to automatically populate the "UserName" textbox in the CreateUserWizardStep1 step.

Below is my code.  Thanks for the help.



<asp:CreateUserWizard ID="CreateUserWizard1" runat="server" BackColor="#FFFBD6" BorderColor="#FFDFAD"
        BorderStyle="Solid" BorderWidth="1px" Font-Names="Verdana"
        Font-Size="10pt" Width="500px" ActiveStepIndex="3">
    &n ...