GTK - draw a box

[Edwin Groothuis <Edwin.Groothuis () riverbed com>]

Hello,

In bug 7931 I have a patch to be able to zoom in into a TCP Graph (tcptrace or stevens) by just marking a rectangle in 
the graph.
It all works fine but there is one thing which I can't make: The automatic drawing of a rectangle when you are marking 
it.

Is somebody here who can give me a clue on how to do the drawing of that rectangle?

Edwin
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