Returns a reference to the Microsoft Office InfoPath 2003 UI object.
expression.UI
expression Required. An expression that returns a reference to an XDocument object.
2: Can be accessed only by forms running in the same domain as the currently open form, or by forms that have been granted cross-domain permissions.
The UI (user interface) object provides a number of methods that can be used to display custom and built-in dialog boxes.
In the following example, the UI property of the XDocument object is used to display a simple message box using the Alert method:
XDocument.UI.Alert("Here is the message text.");