CommandGroup and IsGroupHelp

[NeekoGta]

I make test with this code :

[CommandGroup("test", "t")]
internal class TestCommandController 
{
    [Command(IsGroupHelp = true)]
    public static void TestHelpCommand(Client client)
    {
        client.SendClientMessage(-1, "/(t)est <option>");
        client.SendClientMessage(-1, "optionOne");
    }

    [Command("optionOne", UsageMessage = "/(t)est optionOne <text>")]
    public static void TestOptionOneCommand(Client client, string text)
    {
        //
    }
}

So, If I only execute /test or /t the method of IsGroupHelp (TestHelpCommand) is called. For the moment, it's normal.

But If I execute /(t)est optionOne but without the parameter text, the method of IsGroupHelp (TestHelpCommand) is called instead of (in my opinion) the UsageMessage of TestOptionOneCommand.

It's normal or we can we improve this?