Possible DeactivatePackage bug (1.1b1.1)

I'm trying to make a game that has a few different modes of play. I'm encapsulating each game type in its own package block, with generic functions like CreateControls() and InsertGameObjects(). I've just finished making a simple set of GUIs for exiting the game and starting a new one, but I'm having a problem!

When the user selects a game type I call a function that deactivates all the game-type packages and then activates just the selected game-type package.

However, when I then call the CreateControls() function it doesn't call the one from the newly activated package. It calls the one from the package that was first activated.

Is this a bug in package handling, or a feature of package handling, or is there something I'm not doing to make sure the right package is being activated?

Here's what my code looks like:

function StartGame(%game)
{
	ClearGameMenu();

	DeactivatePackage(Blobs);
	DeactivatePackage(Stacks);
	DeactivatePackage(Trumps);

	switch$ (%game)
	{
	case "blobs":
		ActivatePackage(Blobs);
	case "stacks":
		ActivatePackage(Stacks);
	case "trumps":
		ActivatePackage(Trumps);
	default:
		ActivatePackage(Blobs);
	}

	InitAndStartGame();
}