[Chameleon] Mapscript objects in Chameleon

[Abbott,Arthur]

Everyone,
 
I was just curious, for the various mapscript objects, would all of the methods and attributes be available in Chameleon? I am working with the layer object and I keep getting a "function undefined" error when I attempt to use the "getItem" method of the layer object.  Is that method not available in Chameleon?
 
Could anyone fill me in...
 
Arthur