st: time series plot with shaded bands

["MA V" <ma_v@hotmail.com>]

Hi all--
I think my question must have an easy answer but after searching the 
archives I was unable to find a solution to my problem.
The following piece of code allows one to draw specific lines at given 
dates:

sysuse tsline2, clear
tsset day
tsline calories, tline(28nov2002 25dec2002)

I want to add a shaded band from 28nov2002 to 25dec2002 instead of two 
individual lines. How can I achieve that? And what if I want to add several 
shaded bands for different time periods?
Thanks,
MA

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