Mapscript adding class with PHP

[Arie Mijnlieff]

Hi,

I want to show countries in my world map based on a form with  
checkboxes.

If I check Argentina and Australia i would like to show both  
countries in red, whereas the other are in another color. If i change  
the selection in Australia and India i would like Australia and India  
to be red.

I have a .map file with a layer called countries. In that layer i  
have a class:

    CLASS                   # Start of CLASS object
       NAME 'Argentina'
       EXPRESSION 'Argentina'
       OUTLINECOLOR 100 100 100
	  COLOR 255 255 150
       LABEL
	   SIZE LARGE
	   OUTLINECOLOR 255 255 255
	   MINFEATURESIZE 40
       END
     END                     # End of CLASS object


So i thought if Australia is checked, i add a class object to my  
layer using php with the same colors:

$new_class = ms_newClassObj($this_layer);
$new_class->setExpression('Australia');
$new_class->set('name','Australia');
$new_class->label->outlinecolor->setRGB(255,255,255);
$new_class->label->set(minfeaturesize,40);

Australia will not be red however. I do not understand how i can  
change the color of my new class. I succeeded only to change the  
color of the label.. What do i do wrong ?

If i change the color of an existing class i can see that change  
however..

$my_class = $this_layer->getClass(0);
$my_class->setExpression('Australia');
$my_class->set('name','Australia');

Any help will be appreciated !!

Arie