Screens raw mode?

Hi,

I really like screens because I can detach from a running session and come back later or from somewhere else. This is especially useful when using simh with historical systems.

But from time to time I want to use a graphics terminal emulator such as xterm -t or my own Tektronix 4010 emulator.  It works well with screens until I want to draw some graphics. Screens filters the graphics codes and I get only garbage. Is there a way to turn this filtering off, something like a raw mode?