What i need to do after that ?

[Best-Killer]

Client:

aGuiForm = nil 
_gui = nil 
_root = getRootElement() 
data={}; 
  
addEvent("openGView",true) 
function aViewGui ( player ) 
    if ( aGuiForm == nil ) then 
        local x, y = guiGetScreenSize() 
         
    for i=0,9 do  
        data[i] = {}; 
    end 
         
        data[0].weapon="Sniper" 
        data[1].weapon="Taser" 
        data[2].weapon="Pistol" 
        data[3].weapon="MP5" 
        data[4].weapon="Deagle" 
        data[5].weapon="Ak-47" 
        data[6].weapon="M4" 
        data[7].weapon="Uzi/TEC-9" 
        data[8].weapon="Sawn-Off" 
        data[9].weapon="ShotGun" 
        data[0].price=6000 
        data[1].price=2500 
        data[2].price=3000 
        data[3].price=3500 
        data[4].price=4500 
        data[5].price=4500 
        data[6].price=5000 
        data[7].price=5000 
        data[8].price=5500 
        data[9].price=5500 
         
         
        aGuiForm = guiCreateWindow ( x / 2 - 250, y / 2 - 125, 620, 250, "Skill Shop", false ) 
        aGuiList = guiCreateGridList ( 0.02, 0.09, 0.82, 0.86, true, aGuiForm ) 
        guiGridListAddColumn( aGuiList, "Weapon", 0.50 ) 
        guiGridListAddColumn( aGuiList, "Ammount", 0.80 ) 
        aGuiBuy = guiCreateButton ( 0.86, 0.65, 0.12, 0.09, "Buy", true, aGuiForm ) 
        aGuiClose = guiCreateButton ( 0.86, 0.85, 0.12, 0.09, "Close", true, aGuiForm ) 
        addEventHandler ( "onClientGUIClick", aGuiForm, aClientGuiClick ) 
         
        aMakeList() 
    end 
    guiSetVisible ( aGuiForm, true ) 
    guiBringToFront ( aGuiForm )  
    showCursor(true) 
end 
addEventHandler ("openGView", _root, aViewGui) 
  
function aViewGuiClose ( destroy ) 
    if ( ( destroy ) ) then 
    if ( aGuiForm ) then 
    removeEventHandler ( "onClientGUIClick", aGuiForm, aClientGuiClick ) 
            destroyElement ( aGuiForm ) 
            aGuiForm = nil 
        end 
    else 
    guiSetVisible ( aGuiForm, false ) 
    end 
end 
  
function aClientGuiClick ( button ) 
    if ( button == "left" ) then 
    if ( source == aGuiClose ) then 
        aViewGuiClose ( false ) 
        showCursor(false)     
        elseif ( source == aGuiBuy ) then 
        aViewGuiClose ( false ) 
        showCursor(false) 
    end 
    end 
end 
  
function aMakeList () 
        guiGridListClear(aGuiList) 
        for i,v in pairs(data) do  
            local row = guiGridListAddRow ( aGuiList ) 
            guiGridListSetItemText ( aGuiList, row, 1 , tostring(data[i].weapon) , false, false ) 
            guiGridListSetItemText ( aGuiList, row, 2 , tostring(data[i].price) , false, false ) 
        end 
end 
  
  

guimarker = createMarker ( -2365, 510.18, 29.31, "cylinder", 1.5, 255, 255, 0, 90 ) 
  
function showSkillsgui ( uPlayer )  
      triggerClientEvent ( uPlayer, "openGView", root ) 
end 
addEventHandler ( "onMarkerHit", guimarker, showSkillsgui ) 
  

[Best-Killer]

I don't know how to get which gridlist was selected

[Noki]

guiGridListGetSelectedItem