canvas question


I'm writing a music editing program for gnome but I'm very new to work
with the gnome canvas.
I use the canvas to display all the notes etc. by writing my own items.
But there is a problem.  I had to put a large rectangle in the back to
get 2 things:
1. to color the background -- how can I set the background color for the
   canvas and the bigger problem
2. only with the rectangle I get mouse (pressing) events -- how can I make
   the whole canvas `sensible'?

thanx, Eicke

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