Assign two variables for a checkbox C# Windows Phone 8.1 (Custom Checkbox)

i got a list of checkbox, but i need to pick 2 values, not just the "Content" value, i need a and a value, on just one checkbox.

In C# winforms, i can do this using:

    public CheckBoxCustom : System.Windows.Controls.CheckBox 
    {
        String thing { get; set; }
        float price { get; set; }
    }

and create a new control that receive 2 values, So on C# xaml win phone 8.1 this is not the way to create the control, any tips?