Group Plugin [Need Help]

Hello everyone i come across testing this plugin (Group) found in here http://www.amspublic.org/action%20pl...p?plugin=Group
i have this script in on show

for i = 1, 5 do
result = Group.AddObject("Group1", "xButton"..i);
end


then i have other button to set it visible = false but it does not work.
xButton 6 on click
result = Group.SetVisible("Group1", false);

after click nothings happen.. as far as i know xbutton 1-5 will become hidden but its not.
Group.SetVisible



anyone can help me with this? thanks