Toggle-able Checkbox C# (GTA5 NativeUI)

1 - Make a private bool for the checkbox (since it's a toggle it needs to be bool)
public class <menuname> : Script
{
    private bool checkbox = false;

2 - Create the public menu and add a submenu
    public void Menu1(UIMenu menu)
    {
        var sub1 = _menuPool.AddSubMenu(menu, "Menu 1");
        for (int i = 0; i > 1; i++)
        {

        }
3 - Create the checkbox
        var checkbox1 = new UIMenuCheckboxItem("Checkbox 1", checkbox, "Description for Checkbox ~b~Checkbox 1");
        sub1.AddItem(checkbox1);
        checkbox1.Enabled = true;

        sub1.OnCheckboxChange += (sender, item, checked_) =>
        {
            if (checked_ == true)   // change "(item == checkbox1)" to "(checked_ == true)"
            // essentials it checks if the checkbox has been checked or not, hence true or false
            {
                // if it's checked, this happens
                UI.Notify("~b~Checkbox1 ~w~= ~g~Checked ~w~(This is a notification)");
                UI.ShowSubtitle("~b~Checkbox1 ~w~= ~g~Checked ~w~(This is a subtitle)");
            }
            else if (checked_ == false)
            {
                // if it's not checked, this happens
                UI.Notify("~b~Checkbox1 ~w~= ~r~Not checked ~w~(This is a notification)");
                UI.ShowSubtitle("~b~Checkbox1 ~w~= ~r~Not checked ~w~(This is a subtitle)");
            }
        };

    }
}