Thanks for your post.
We can reproduce this behaviour and added to our database. Our engineers will review this issue in next Formativ update.
NewFilePickerDialog was introduced in Formativ 1.5, most of our customer and commercial products now use Formativ 2.0 visual forms controls. We suggest you to use Formativ 2.0 controls, our engineers have written a sample applet which list available files in a TRzCheckList control. You can download the sample applet from here: http://beta.advansyscorp.com/sample-applet-list-available-files-checklist.zip
Hope this helps. If you have any further questions, please do not hesitate to contact us.