print #handle, "redraw"
or
print #handle, "redraw "; idNum
or 
print #handle, "redraw "; segmentName

This command causes the window to redraw all flushed drawn segments, or a specific drawn segment. The specific segment can be identified by the ID number assigned by Just BASIC and retrieved with a SEGMENT command, or it can be a segment name assigned by the program when the FLUSH command is issued.  Any deleted segments will not be redrawn (see DELSEGMENT).  Any items drawn since the last flush will not be redrawn either, and will be lost.