Customization to compare two values (Re-Enter Data)

Looking for some guidance or examples for custom logic to re-enter a field to validate that the user has entered it correctly, something very much like every web form you’ve ever filled out that makes you enter your email twice.

We may not want to add a second field on the form, but rather a pop up dialog box that fires when the user leaves the field (and the field contains data). They would renter the data in the dialog box and if they match they continue on.

Any help or ideas are much appreciated
Thanks,
Joe

You could use the AfterExitEditMode event of the textbox to check if there is a value and, if so, throw a simple form up to have the user confirm the value.