Here is a list of all documented typedefs with links to the documentation:

AeonGUI_Document : PluginAPI.h
AeonGUI_Element : PluginAPI.h
AeonGUI_Event : PluginAPI.h
AeonGUI_EventCallback : PluginAPI.h
AeonGUI_OnLoadFunc : PluginAPI.h
AeonGUI_OnUnloadFunc : PluginAPI.h
AeonGUI_PluginContext : PluginAPI.h