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CallbackValidationRole for checkbox control

The example below shows how to create a new CallbackValidationRole and register it for checkbox usercontrol. It is done in the Loaded event called once when the form is firstly loaded in the browser.

using System;
using System.Collections.Generic;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Media;
using System.Windows.Shapes;
using System.Xml.Linq;
using Neurodot.Forms.Controls;
using Neurodot.Forms.CustomControls.RadioGroup;
using Neurodot.Forms.Render;
using Neurodot.Forms.Render.Interfaces;

public static partial class FormCodeClass
    // To find controls in the current visual tree (i.e. the form) use static methods:
    // object ThisForm.FindElement(string elementName); or 
    // T ThisForm.FindElement<T>(string elementName);

    static CheckBox _checkBox = ThisForm.FindElement<CheckBox>("CheckBoxConfirm");

    public static void Loaded(object sender, System.Windows.RoutedEventArgs e)
        var role = new CallbackValidationRole("$CheckValidationMessage") { Callback = ValidateConfirmCheckBox };
        ThisForm.RegisterValidationRole(_checkBox, role);
    // Validates if the checkbox is checked.
    // Returns true if the checkbox is checked (valid); otherwise, false (invalid).
    private static bool ValidateConfirmCheckBox()
        return (_checkBox.IsChecked == true);