Subclassing js:List

[Harbs]

I just tried making an mxml component based off js:List in FlexJS and it 
doesn’t seem to work.

I get an error when the js code tries to execute:
this.generateMXMLAttributes
  ([0,
0,
1,
'initComplete',
this.$EH0
  ]);
TypeError: undefined is not a function


I searched the asjs files for this function and it looks like only components 
which implement IMXMLDocument have this function. List, ListBase and UIBase all 
do not seem to implement this. Is this an oversight, am I missing something, or 
what?

Thanks,
Harbs