[R] How to repress the annoying complains from X window system

[Hao Liu]

Dear All:

I am running some GUI functions in linux environment, they runs fine, 
however I constantly get this kind of message in R console:

Warning: X11 protocol error: BadWindow (invalid Window parameter)

Is there a way to repress it? Or am I doing something wrong here.. it 
does not interfere with the running of fucntion though.

Thanks
Hao