How do I make a dropdown list to the secret question instead of the defualt TextBox?

[Learner]

Hello ,
Our people need a dropdown list to the Secret Question instead of the
default textbox. When I focused on the "Secret Question" text and got
the properties its a textbox control

"CreateUserWizard1.ContentTemplate.Question
System.Web.UI.WebControls.TextBox" so its a TextBox control.

I can change replace this a with a DropdownList but I don't know how do
I capture this value and tell the system to take
"dprlSecretQuestion.SelectedValue" instead of the TextBox value.

I am not sure if this is the event

Protected Sub CreateUserWizard1_CreatingUser(ByVal sender As Object,
ByVal e As System.Web.UI.WebControls.LoginCancelEventArgs) Handles
CreateUserWizard1.CreatingUser

End Sub

I should write the code but how and where I should write it.

Please some one give me a hand here?

Thanks
-L