cl_gui_docking_container doubt ???

Hi, everybody.

I define 2 ALVs in the same screen with Header Html.

I split the container usint cl_gui_docking_container.

     doc_at_top = header

     doc_at_left = alv1

     doc_at_right = alv2

It works, but i have a big challenge now.

is possible to put one on top of another??? using cl_gui_docking_container

     top       = header

     middle = alv1

     bottom = alv2

Thank you in advance