Colorizing line only works once?

[JJS]

Hello,


i used this lesson: 
http://lessons.livecode.com/m/datagrid/l/7332-how-can-i-colorize-individual-lines-in-a-table

to colorize a few lines in my DG. When in one column the value is 1 then 
the line stays black, when it is a 2 the line becomes red.

Now it just works :)...but only 1 time.


After repopulating the DG with stuff from an other category it does not 
do it although the same sequence is being done.

It only does it again when i reload the stack in the IDE.


Any idea what i can do?

Refresh index or line does not help


Thanks for any help.


Jerry