[R] grid and ps device (bg-color)

[mkondrin]

Hello!
Is it a bug or something?
When I try to draw a grid-graphics on ps output background color is 
always transparent (with standard plot(...) this is not the case  - the 
background is filled with ps.options()$bg color).  What's wrong? Drawing 
a background grid.rect does not help - there is always small transparent 
margains along picture frame. Can this be fixed (I use R-2.0.1)?