dialog with tailboxbg and gauge

Hello,

I wrote a shell-script that does lots of work.
To inform the user about the progress, I use dialog –gauge with displays a nice progress-bar.
As the time between updates are sometimes quite long, I’d like to display the log file in a tailboxbg widget, but I’m not able to make both widgets work at the same time.
My script works with either –gauge or –tailboxbg but not both. When I define both widgets, both are displayed, but the tailbox is not updated. It looks like tailboxbg waits for gauge to exit.
I also tried to run 2 dialog processes in parallel, but this scrambles the screen.
Any idea ?

Cheers
Bernhard