When you assign a colour to a layer, all shapes having this layer will display no filling (background colour).
So if I were to need an annotation shape, whose visibility and "printability" are controlled by means of layers, and get coloured by means of this layer to mark them as belonging to this layer, I can't enhance the visibility by means of additional colour.
Would any of you guys have a bright idea on how to overcome this restriction? (ie having layer + (automatic background colour or automatic foreground colour and manual background colour) ).