Using GhostView as a Print Preview function

[Spencer Buckner <bucknersa attglobal net>]

In a gnome application I am attempting to use GhostView as a Print 
Preview function for viewing a window containing graphics.  To bring up 
GhostView when the Print Preview menu item is clicked, the program uses 
the statement:

system("gv -portrait -letter -scalebase 2 tempfile.ps");

The postscript file, tempfile.ps, already exists.  The problem is that 
the GhostView window does not appear unless the mouse cursor is moved 
across some part of the application window.  If the cursor is not moved, 
the GhostView window never appears.  Moving the mouse cursor outside the 
application window has no effect.  Pressing the Enter button half a 
dozen times will also cause GhostView to appear.  Typing the same 
command in a terminal window and pressing Enter brings up GhostView 
immediately.  How can I cause GhostView to appear without the user 
having to move the mouse?  There is an update command that would seem to 
do the job, but I believe it is a Tcl command.  When I use it, I get an 
error message saying the update command doesn't exist.  I am using 
RedHat 8.0.

Thanks.