For i,v in pairs with mousebutton1down function?

I have a buying system. A player buys a cart, for every cart they purchase, then a ImageButton is created in a ScrollingFrame with a UIGridLayout. I'm assuming my problem is that the pairs function is grabbing the ImageButtons when the script initially runs. There is no image buttons in the scrolling frame until a player buys a cart in-game. I'm not sure a way around that. Here's my script,

game.Players.LocalPlayer:WaitForChild("PlayerGui")
game.ReplicatedStorage.RemoteEvents.updatePlayerCarts:FireServer()
mcstatus = false
mcdb = false
script.Parent.myCartsButton.MouseButton1Down:connect(function()
    if mcstatus == false and mcdb == false then
        mcdb = true
        script.Parent.myCarts:TweenPosition(UDim2.new(.1,0,.2,0))
        script.Parent.myCartslabel:TweenPosition(UDim2.new(.1,0,.135,0))
        wait(1.2)
        mcstatus = true
        mcdb = false
    elseif mcstatus == true and mcdb == false then
        mcdb = true
        script.Parent.myCarts:TweenPosition(UDim2.new(1.1,0,.2,0))
        script.Parent.myCartslabel:TweenPosition(UDim2.new(1.1,0,.135,0))
        wait(1.2)
        mcstatus = false
        mcdb = false
    end
end)

for i,v in pairs(script.Parent.myCarts:GetChildren()) do
    if v:IsA("ImageButton") then
        v.MouseButton1Down:connect(function()
            print("Working!")
        end)
    end
end

Thanks for anyone who helps me.