UI++ for authenticating the OSD process

Hi, I'm just looking to use UI++ for authenticating to AD before allowing the user to continue the rest of the task sequence.

On page 12 of the documentation there's a authentication box without the cancel button.  I tried:

<Action Type="UserAuth" Title="User Authentication" Domain="myDomain" ShowCancel="False" ShowBack="False" GetGroups="False" MaxRetryCount="5" />

But alas, the cancel button is still available.  

Also able to edit the domain still with this line under my Action tag:

<Field Name="Domain" ReadOnly="True" />



Here's my whole XML file:

<?xml version="1.0" encoding="utf-8"?>

<UIpp Title="myCompany" Icon="UI++2.ico">



<Actions>

<Action Type="DefaultValues" />

<!--User Authentication-->

<Action Type="UserAuth" Title="User Authentication" Domain="myDomain" ShowCancel="False" ShowBack="False" GetGroups="False" MaxRetryCount="5" />

<Field Name="Domain" ReadOnly="True" /> 
</Actions>

</UIpp>


Thanks for any suggestions.