18. User-Defined Class Hierarchy — Windows Abstract classes w_master w_detail Base classes w_main Concrete classes w_invoice w_customer w_lineitem w_order
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47. Window Ancestor — By Type {u_dw} {w_sheet} Abstract classes Concrete classes dw_list dw_detail {w_list_detail}
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50. Window Hierarchy — By Type PowerBuilder system class Abstract classes {window} {w_anc_main} Type is main {w_anc_popup} {w_anc_sheet} {w_anc_child} {w_anc_response}