When using a selection based List Box, it is important to know that the field data displaying in the List Box will be updated only when the selection is reloaded or changed. A simple way to reload the current selection is build a temporary named selection and load it. Here is an example code:

CUT NAMED SELECTION([TableName];"tmpSel") USE NAMED SELECTION("tmpSel")

Please note that the code example shown above can be executed anywhere within the context of the form.