Grouped List

Question

Hi all,
I want to develop grouped list functionality in windows phone 7. I want to use longlist selector control. I am not using XAML. I have gone through some of the links regarding this. I found that it is required to define the data template of the list. I can not define data template as items in the list are not fixed and is determined at runtime only. So has anybody idea about how to do this?

Thanks in Advance,
Krishna