Enable close Button in Oracle forms R12

In Program units You will have APP_CUSTOM Package 
Change the code in procedure as required to close_window of APP_CUSTOM 
package to handle close button 

For example like 
if (wnd = '<your_window_name>') then 
app_window.close_first_window; 
elsif (wnd = '<another window>') then 
--defer relations 
--close related windows 
null; 
elsif (wnd = '<yet another window>') then 
--defer relations 
--close related windows 
null; 
end if;

Bahaa Barghouti 
Thanks,