[Chameleon] categorize single polygon layer into different color

[Rajan Man Bajracharya]

Dear All,

I am having problem to categories single polygon layer i.e. to change the 
color depending upon the unique values of the polygon feature. Is it a map 
file or the widget that needs to be changed.

e.g. my map file for area zonation polygon layer looks like this

LAYER
   GROUP "Vector"
   NAME area_zonation
   TYPE POLYGON
   DATA area_zonation
   STATUS ON
   CLASS	# how will this data look?
     NAME 'area_zonation'
     TEMPLATE "airports.html"
     OUTLINECOLOR 128 128 128
     COLOR 225 225 185
   END
   TOLERANCE 5
END

Above COLOR tag is the color for whole area_zonation layer. But here I need 
to change the color depending upon the unique value and change the color of 
each zone accordingly.

Any help regarding this would be highly appreciated.

Regards,
-rajan