dialog menu blues

Hi,
I am working on a script for a HUD. The menu needs to appear again after a button is selected. I have read various threads on this matter and I just can't see what I am doing wrong.
This is the most basic structure of it and I can't even get this working lol. Any help would be appreciated.

integer menu_channel = -154287;
list menu_main = ["test"];

default
{   
     state_entry()
    {
        llListen(menu_channel, "", NULL_KEY, "");
    } 
    touch_start(integer total_number)
    {
        llDialog(llDetectedKey(0), "What would you like to do ?", menu_main, menu_channel);
    }
    listen(integer channel, string name,key id, string message) 
   
    {  
        if (llGetOwnerKey(id) == llGetOwner())
        {  
            if (message == "test")
            {
                llSay(0,"testing..."); 
                llDialog(llDetectedKey(0), "What would you like to do ?", menu_main, menu_channel);
            }
        }
            
    }
     
}
CODE

integer menu_channel = -154287;
list menu_main = ["test"];

default
{
    state_entry()
    {
        llListen(menu_channel, "", NULL_KEY, "");
    }

    touch_start(integer total_number)
    {
        llDialog(llDetectedKey(0), "What would you like to do ?", menu_main, menu_channel);
    }

    listen(integer channel, string name,key id, string message)
    {
        if ( id == llGetOwner() )
        {
            if (message == "test")
            {
                llSay(0,"testing...");
                llDialog( id, "What would you like to do ?", menu_main, menu_channel);
            }
        }
    }
}

llDetectedKey(0) works in the scope of the touch event, not in the listen event.
llGetOwnerKey(id) will return id, so it is overkill.

happy scripting

Thank you so much Dora
That worked a treat !