Position context menu based on focused list position?

Like the thread title says, how can I position the context menu based upon the focused item in the list?

I know the context menu without <coordinates> is positioned based upon the current list position, but this is for the whole list control. I want to move based upon the current position in the list. Basically I'm trying to have a type of tooltip style popup context menu.

I tried using a slide animation referencing list position, but I don't think the context menu dialog can get ids that are outside the context menu?

I have a feeling that what I want to do is not possible, but maybe someone knows a trick?