Gnome::Canvas::Line::property_line_style()

I have this simple code:

Gnome::Canvas::Line segm = new Gnome::Canvas::Line(*(canvas->root()), points);
segm->property_width() = 2;
segm->property_color() = "black"
segm->property_line_style() = Gdk::LINE_DOUBLE_DASH;

where "points" is an appropriate Gnome::Canvas::Points.

The problem is that the line is filled black but without any dashing. I tried also Gdk::LINE_ON_OFF_DASH, same problem. It's like that this instrucion does nothing.
For other properties ther's usually a property_***_set() function, but not in this case. 
Wher's the problem?
Thx in advice,

Marcello

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