REFERENCE(I_TREE_CONTROL) TYPE REF TO CL_GUI_COLUMN_TREE
REFERENCE(C_TREE_CONTROL) TYPE REF TO CL_GUI_COLUMN_TREE
REFERENCE(HANDLE) TYPE REF TO CL_GUI_COLUMN_TREE
REFERENCE(C_WORK_TREE) TYPE REF TO CL_GUI_COLUMN_TREE
REFERENCE(MODEL_TREE_ER) TYPE REF TO CL_GUI_COLUMN_TREE