public void ExecuteLowPrioCommandAsync(Command command, EventHandler <CommandExecutedEventArgs> callback)
{
lock (queue)
{
if (!queue.Any(q => q.Key.Type != command.Type))
{
queue.Enqueue(new KeyValuePair <Command, EventHandler <CommandExecutedEventArgs> >(command, callback), 1);
resetEvent.Set();
}
}
}