Well
solved - but I will explain how....
I needed to draw a domain marker like the image above, the first line is a value in the domain and the second line is another value, both of the values are for an object which has begin time and end time, so what i did is override the drawDomainMarker method and change it to draw this, a line range in the top contained in a rectangle (see the attached image),
Thanks any way , this form is very usefull to me
