"Make the starting level follow the active menu item." does'nt work with views menus?

Hi,

I have an issue with a block menu.
My menu is :
Link0
- Link1
-- Link 1A
-- Link 1B
- Link2

Link1 and Link1A refer to views with arguments (taxonomy ID and depth), so they have same [router_path] but not same [link_path].
I tried to display menu block with only children links : it's not possible for me, because it displays only level 2 (Link1 and 2), and doesn't seem to find "active menu item"... When i print $tree, all links have their "below" empty.
I didn't find how to have menu block which displaying Link1A and Link1B.

I'm trying to find where is the issue in the code.
If you have any question, don't hesitate.