Check theses programs using class CL_GUI_ALV_TREE:
SAPTLIST_TREE_CONTROL_DEMO
BCALV_TREE_DEMO
BCALV_TEST_SIMPLE_TREE
BCALV_TREE_01
BCALV_TREE_02
BCALV_TREE_03
BCALV_TREE_04
BCALV_TREE_05
BCALV_TREE_06
BCALV_TREE_DEMO
BCALV_TREE_DND
BCALV_TREE_DND_MULTIPLE
BCALV_TREE_ITEMLAYOUT
BCALV_TREE_MOVE_NODE_TEST
BCALV_TREE_VERIFY
Post explaining how to use the class CL_SALV_TREE : https://blogs.sap.com/2018/01/04/salv-treecl_salv_tree-functionalities-events-and-tricks/
Demo program using function module REUSE_ALV_HIERSEQ_LIST_DISPLAY :
BCALV_TEST_HIERSEQ_LIST
BCALV_TEST_HIERSEQ_LIST_EVENTS
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