Navigating through the items of a datablock

Question

Hi,
I'm trying to navigate through all the items of a datablock to set the item property 'visible' to false. It works except for the last item. It gives me the following error: FRM-41016: Cannot set DISPLAYED attribute of the current item. Even when I first go to the first item of the datablock or the previous item. Does the cursor also navigates to items that are invisible or don't have a canvas? Any help?
This is my code:
PROCEDURE HIDE_ITEMS (datablock in VARCHAR2) IS
l_curr_item VARCHAR2(40);
BEGIN
go_block(datablock);
go_item(Get_Block_Property(datablock, FIRST_ITEM));
LOOP
l_curr_item := :system.cursor_item ;
NEXT_ITEM;
IF l_curr_item = Get_Block_Property(datablock, LAST_ITEM) THEN
go_item(Get_Block_Property(datablock, FIRST_ITEM));
SET_ITEM_PROPERTY(l_curr_item,VISIBLE,property_false);
EXIT;
END IF;
SET_ITEM_PROPERTY(l_curr_item,VISIBLE,property_false);
END LOOP;
END HIDE_ITEMS;
Thanks

Answer 1

You can cycle through the items in a block by using the FIRST_ITEM property, then use Get_Item_Property to find each item's NEXTITEM. Then you can test each item using Get_item_property to determine if it is NAVIGABLE.
You should not use go_block or go_item to do any of this.