Tree Object Refresh Problem

Hi everybody,

I made a report that shows in a docking container a cl_gui_list_tree. When i double click on a node another docking container display the related info in an ALV.

if i go back to the main screen i used the free method of the cl_gui_list_tree object, but when i changed the initial parameters and execute again the report the docking container that owns the cl_gui_list_tree object is apearing empty.

PD. Every time the report is execute the cl_gui_list_tree object is created and its nodes rebuildt.

What shoul I do in order to refresh the content of the cl_gui_list_tree?

Regards,

Eric