Choice Box Help

[Slimwaffle]

I was wondering if someone could please help. How do I add an if condition to say "if choice box text = to an item in mitem{}, then the current selected table index[] is__" So that later on in my code I can say if trash button is pressed selected index is = to selected index -1

--Material Item List
    mitem ={}
    mitem[0] = "Wood" 
    mitem[1] = "Steel"
    mitem[2] = "Concrete"
    mitem[3] = "Rubber"
    mitem.icount = {}
    mitem.icount[0] = 100 
    mitem.icount[1] = 200 
    mitem.icount[2] = 300
    mitem.icount[3] = 400

    for i=0, #mitem do
        
        local selected=false
        
        GameMenu.materials:AddItem( mitem .." = "..mitem.icount)
    end
    
    GameMenu.trashmat = Widget:Button("Trash",250,y,72,30,ipanel)
    y=y+sep