CUSTOM.pll Code for Tabs/Buttons

Hiding Tab
my_tab_page_id TAB_PAGE;
begin
if (event_name = 'WHEN-NEW-FORM-INSTANCE') then
if (form_name = 'OEXOEORD') then
my_tab_page_id := FIND_TAB_PAGE('ORDER_REGIONS.LINE_ITEMS');
SET_TAB_PAGE_PROPERTY(my_tab_page_id,VISIBLE,property_FALSE);
end if;
end if;

Renaming Tab
my_tab_page_id TAB_PAGE;
begin
if (event_name = 'WHEN-NEW-FORM-INSTANCE') then
if (form_name = 'OEXOEORD') then
my_tab_page_id := FIND_TAB_PAGE('ORDER_REGIONS.LINE_ITEMS');
SET_TAB_PAGE_PROPERTY(my_tab_page_id,LABEL,'XX Items');
end if;
end if;

Hiding Button
if (event_name = 'WHEN-NEW-FORM-INSTANCE') then
if (form_name = 'OEXOEORD') then
app_item_property2.set_property('ORDER_CONTROL.BOOK_ORDER',displayed, PROPERTY_false);
end if;
end if;

Renaming Button  
if (event_name = 'WHEN-NEW-FORM-INSTANCE') then
if (form_name = 'OEXOEORD') then
app_item_property2.set_property('ORDER_CONTROL.BOOK_ORDER',Label,'Please confirm');
end if;
end if;