change the colour of widget after it has been shown

[anuradha arora <anuradhampls yahoo com>]

please give me some hint on how to solve this...

the problem is that i have already drawn an (arrow)
widget, and after gtk_main has been called, i will
monitor a file for input. 

when there is input, a function will be called, and 
I have the address of the arrow widget, and now at
this stage, is there any way to change its color to
some other, and back, i.e. as if the arrow has flashed
....

(i dont want to destroy it and redraw it with another
color) 

regards,
anuradha.

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