A GDBusObjectProxy is an object used to represent a remote object
with one or more D-Bus interfaces. Normally, you don't instantiate
a GDBusObjectProxy yourself - typically GDBusObjectManagerClient
is used to obtain it.
Sets our main struct and passes it to the parent class.
Creates a new GDBusObjectProxy for the given connection and
Gets the connection that proxy is for.
Get the main Gtk struct
the main Gtk struct as a void*
the main Gtk struct