Thank you for all your answers, so the z-order determine visibility of text elements.
But know I have the opposite questions: I have a kPDEPath with coordinates that cover the whole page, and with z-order higher then some Text elements, but I can see these text.
The Path has the 'fill' paintOp. How this can be possible? Maybe the Path has some 'rendering' or transprency params that allow the elements below to be rendered?
Thank you