Challenge: how to set the text of a field

[David Bovill]

OK - lets rename the challenge :) Same problem - but defining it as follows:

   - Is it possible to create a handler in the behavior of a shared group
   that returns the number of the card the shared group is on?

This is the same problem - it is a problem of finding a reference to the
card a control is on so that you are able to return values of properties of
the group such as a hilite or text that can differ from card to card. As
far as I know there is actually no way at all to do this.

Although I thought parsing the long id works - it does not. So the
following handler does not work.

getprop card_Number
   put the long id of the target into targetObject
   repeat
      if word 1 of targetObject is "card" then
         put the number of targetObject into cardNum
         return cardNum
      end if
      delete word 1 to 4 of of targetObject
      if targetObject is empty then return empty -- just in case
   end repeat
end card_Number
In fact the behavior of references to shared "background" groups is quite
bizarre! Take the following experiment - create a shared background and
place it on 3 cards - add the handler above to the script of the shared
group. It can be the behavior of the group or its script.

Now given you are on the first card - issue the following from the message
box:

put the card_Number of group 1 of card 3  --> answer is 1
put the card_Number of group 1 of card 2  --> answer is 1
put the card_Number of group 1 of card 1  --> answer is 1

Now try removing the group from the first card, and do the same again:

put the card_Number of group 1 of card 3  --> answer is 3 - ie correct!
put the card_Number of group 1 of card 2  --> answer is 2 - ie correct!
put the card_Number of group 1 of card 1  --> well there isn't one so you
get an error

Summary - this is a bug. It also makes it impossible to define some basic
and useful behaviors for shared "bakground" groups.