With the TX you do have the ability to move down the page (or up) when multiple items are shown, not just from box to box.
Try pressing the DPad on the left or right (you may have to do this more than once based on where you are in the application) and you'll see different things highlighted. Pressing left in many programs produces a "blue" line at the top of the list and a "blue" line at the bottom of the list. Once you have these two lines a press down will give you the next page, a press up will give you the previous page.
Once you are in this mode, pressing the center button will now allow you to change the selection to individual records within the list and a press up/down will move record by record. Once you have the record you want highlighted, another press on the center button will select that record and open it.
But be aware that some third party applications have not been updated to handle this newest navigation mode and may not function this way until they are updated.
fnagle