context parameter in pagemethods

The context parameter in pagemethods is being lost

Here is what I do

var contextArray = new Array(2)

PageMethods.DoSomeMethod(param1,param2,param3,OnSucceeded, null,null,null,contextArray)

function OnSucceeded(result, response, context)

the context array shows ASPX_defult_DoSomeMethod

Why is it not returning the contextArray that I passed?

So I checked the internals of PageMethods using debug.traceDump and I can see that after calling PageMethods.SomeMethod the _usercontext variable does not get set

Infact I have to set it using PageMethods.set_defaultUserContext

Am I missing a library or are the parameters for PageMethods.DoSomething not correct !!!

Please Advice