Modal View Issue

[materialised]

I have an issue with some of my views, here is a breif outline of my setup:

Tab Bar Controller
|
--View Controller 1
|
--View Controller 2
|
--View Controller 2
On a certain action, View Controller 1 will display a modal dialogue. Within this dialogue, if the user performs another action, then another modal dialogue is shown, using the first modal dialogue to present the view.

On the 2nd ModalDialog I have a UITextField, however when I attempt to type into the text field, nothing happens. Even though the keyboard is displayed and the textFieldDidBeginEditing method is called. I have setup the UITextFieldDelegate and the necessary responders, but to no avail.

Does anyone know what would cause this issue?

Many Thanks