How to get top (or visibles) polygons in specific Layer with ArcObjects

Hi everyone!

I need to create an ArcObjects function to get the top (or visibles) polygons in specific layer. It's possible? I have a Layer with a lot of polygons in the same area but i have to get the top or visibles. I think it's not possible using ISpatialFilter! :-(

Thank´s a lot!

Attached Thumbnails