It seems like nodes aren't being added the parent node's child list when using the Cocoa MaxGUI driver. Therefore, we can't iterate through them and expand them.
I don't think there is much you can do about this - you could try posting a bug report in the MaxGUI Bug Reports forum, but I wouldn't hold your breath!
I don't think there is much you can do about this - you could try posting a bug report in the MaxGUI Bug Reports forum, but I wouldn't hold your breath!