    class
    	WEL_HDN_CONSTANTS

    General
    	cluster: wel
    	description: "Possible notification messages of class WEL_HEADER_CONTROL"

    Ancestors
    	ANY

    Queries
    	hdn_begin_track: INTEGER_32
    	hdn_divider_dbl_click: INTEGER_32
    	hdn_end_track: INTEGER_32
    	hdn_item_changed: INTEGER_32
    	hdn_item_changing: INTEGER_32
    	hdn_item_click: INTEGER_32
    	hdn_item_dbl_click: INTEGER_32
    	hdn_track: INTEGER_32