TomTom, like most PPC applications, might be programmed to display at a specific resolution. What resolution are you using on your 8" TFT? Are you using the 480x640 true VGA hack on your Axim? Also, are you sure you have the X50v and not the X50, because your screenshot posted above is 240x320 and not 480x640. Below you will see what a true 480x640 screenshot looks like when attached in a post.
To answer your previous question, I use Pocket Plus to display today screen shortcuts like TomTom. See the shortcut in the screenshot I use below.
Screen0090.JPG