FXText scrolling

[Stefan Schmiedl]

Greetings,

I have a window with a

FXText.new(group, @log, FXDataTarget::ID_VALUE,
TEXT_READONLY|LAYOUT_FILL_X|LAYOUT_FILL_Y)

If I put enough text into @log.value, a avertical scroll bar appears.
So far so good.

If I try to scroll, the display immediately jumps back to the
top of the FXText window.

Clicking into this widget shows me a red hair cursor right in
front of the first character, which refuses to be moved, too.

What am I missing here?
Where should I have looked to find the solution myself?

Thanks,
s.