how to bind Table based on context?

Hi,

I have xml view which has table. I want to bind the table based on the context. <Table items="{RuleProdcut}">. It should be <Table items="{RuleProdcutGroup}"> based on context.

I tried adding code in onBeforeRendering() in controller but I dont get call to this function at all.

Pls help!

Thanks,

Rashmi