I'm just trying to get my addon panel to show up into the 3D view port, but I can't figure out the correct 'bl_' combination to make it work.
bl_space_type = 'VIEW_3D' will place your panel within the 3dview. You then set
bl_region_type = 'TOOLS' to have it show in the tools region while the less intuitive
bl_region_type = 'UI' places it in the properties region.
If you want to place a panel in the properties editor, you would set
bl_space_type = 'PROPERTIES' and
bl_region_type = 'WINDOW', then you set
bl_context to match the context you want it shown in -
Also remember that you need to register your panel class -
def register(): bpy.utils.register_class(MyPanel)