How to implement item double click for cl_gui_alv_tree?

[kavmp]

I have existing code that uses cl_gui_alv_tree class.
I have a gist of the PBO code as below: 
Just pasting a brief syntax of what I have here since there's a lot of code.

CREATE OBJECT go_custom_container
CREATE OBJECT go_alv_tree 
PERFORM build_hierarchy_header CHANGING l_hierarchy_header. 
PERFORM build_fieldcatalog.
CALL METHOD go_alv_tree->set_table_for_first_display
PERFORM create_hierarchy USING iw_h_job_chain.
CREATE OBJECT go_events. "kavin
  SET HANDLER go_events->node_double_click FOR go_alv_tree. 
  SET HANDLER go_events->item_double_click FOR go_alv_tree. 
  CALL METHOD go_alv_tree->update_calculations.
  CALL METHOD go_alv_tree->frontend_update.
  CALL METHOD cl_gui_cfw=>flush

I have defined the below methods in lcl_event_receiver (object go_events)    item_double_click FOR EVENT item_double_click OF cl_gui_alv_tree IMPORTING fieldname node_key,
node_double_click FOR EVENT node_double_click OF cl_gui_alv_tree  IMPORTING node_key.

The tree is displaying properly but the double click on item level is not working. It is not getting triggered also in fact. Don't know what I am missing here. Please help with this thanks!