code: func (c *Callbacks) OnCNETMsg_SpawnGroup_LoadCompleted(fn func(*dota.CNETMsg_SpawnGroup_LoadCompleted) error) {
  	c.onCNETMsg_SpawnGroup_LoadCompleted = append(c.onCNETMsg_SpawnGroup_LoadCompleted, fn)
  }
docs: // OnCNETMsg_SpawnGroup_LoadCompleted registers a callback for NET_Messages_net_SpawnGroup_LoadCompleted