I have multiple text boxes in a title, each linked to a specific row in an xml data source (one through ten for example). When the data source no longer contains 10 rows (an update occurred and the xml has changed to 5 rows for example) I see that the the textbox value seems to hold the last value, even though the corresponding row of data is no longer available in the xml file.

What I would like to script is that if the textbox value = "" then hide the textbox or add a mask over it etc. Does anyone know how to address this? I had also obviously though of an API call to check the value directly from the data source, but I can't seem to find examples of that syntax that don't include the system XML.