How do I get an object in front of a walk-behind?

[BenRangel]

By default, objects seem to fall BEHIND walk-behinds.
How do I get them to be IN FRONT of them instead?

Must be really simple...but I can't se any options for it.

[Ashen]

It's to do with baselines.
Check this recent question (especially the last post) for more details, and post there if you need more help with it.