Writing LoTRO Lua Plugins for Noobs

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I created a simple popup context menu, invoked by a chat command, using an example from the Helm's Deep Lua API Documentation.

contextMenu=Turbine.UI.ContextMenu();

menuItems=contextMenu:GetItems();
menuItems:Add(Turbine.UI.MenuItem("Option 1"));
menuItems:Add(Turbine.UI.MenuItem("Option 2"));

local i;

for i=1,menuItems:GetCount() do
    local menuItem=menuItems:Get(i);

    function menuItem.Click(sender,args)
        Turbine.Shell.WriteLine("You have selected "..sender:GetText()..".");
    end
end

contextMenu:ShowMenu();

What I would like to do is detect when the menu closes without a menu option being selected. I assume this can be achieved with the use of a callback and/or update function, but I just can't figure how to do it.

Any advice please?

P.S. "Garan has exceeded their stored private messages quota and cannot accept further messages until they clear some space."