Screen elements missing: I have a screen that looks like a "table" composed of text and vertical bars "|". GuiXT doesn't show any screen elements for this screen. Is there a way to read the screen content into GuiXT variables?

This is an ABAP list output.
You can use the system variables V[_listline(i)] to read the values.
Please see our TIps, Tricks and Samples section, "ABAP list", "Read the content of an ABAP list".