InfoPath Dev

I am using the position() function to display the position in which each row in a repeating table is located in the XML. This is being shown to the user using an Expression Box next to each row. How can I display that position in the screentip of an error (from Data Validation) and/or in the error generated by using the ...

I am using 'Validating' and 'Changed' events for all of my controls, do to the nature of some of my error messages. This means I am not using the built-in InfoPath Data Validation for each control. When the value in one control is changed, I would like it to run the 'Validating' and 'Changed' methods for that ...