Thank you Michal,
The scenario is that initially, no objects are present in the scene.
I create "browse" object by creating a Forest object, then browse the library and pick items I like from there. It could be single objects or presets.
Then, I unhide the "forest_templates" layer and start adding multiple custom objects.
I was hoping there was a smarter way to browse meshes.
I'll investigate the Creating Libraries tutorial as well.