using System.Windows;

    namespace MicrosoftDaysFind22S.Controls
    {
public partial class ToggleSwitchWithHelp
{
    public ToggleSwitchWithHelp()
    {
        InitializeComponent();
    }

    public string Header
    {
        get { return (string) GetValue(HeaderProperty); }
        set
        {
            HeaderTextBlock.Text = value;
            SetValue(HeaderProperty, value);
        }
    }

    public bool IsChecked
    {
        get { return (bool)GetValue(IsCheckedProperty); }
        set
        {
            ToggleSwitcher.IsChecked = value;
            SetValue(IsCheckedProperty, value);
        }
    }

    public static readonly DependencyProperty HeaderProperty =
        DependencyProperty.Register(
            "Header", typeof(string), typeof(ToggleSwitchWithHelp), new PropertyMetadata("Неизвестная настройка"));

    public static readonly DependencyProperty IsCheckedProperty =
        DependencyProperty.Register(
            "IsChecked", typeof(bool), typeof(ToggleSwitchWithHelp), new PropertyMetadata(false));

    private void ToggleSwitcher_CheckedChange(object sender, RoutedEventArgs e)
    {
        if (ToggleSwitcher.IsChecked != null) IsChecked = (bool) ToggleSwitcher.IsChecked;
    }

    private void ToggleSwitcher_OnLoaded(object sender, RoutedEventArgs e)
    {
        ToggleSwitcher.IsChecked = IsChecked;
    }

    public delegate void NotifyCallUserHelpPageEventHandler(string settingName);

    public event NotifyCallUserHelpPageEventHandler CallUserHelpPage;

    protected virtual void OnCallUserHelpPage()
    {
        NotifyCallUserHelpPageEventHandler handler = CallUserHelpPage;
        if (handler != null) handler(Header);
    }

    private void HelpButtonClick(object sender, RoutedEventArgs e)
    {
        OnCallUserHelpPage();
    }
}
    }

public void ToggleSwitchWithHelp_OnCallUserHelpPage(string settingName)
    {

    }

<controls:ToggleSwitchWithHelp
                    Header="Использование местонахождения"
                    IsChecked="{Binding IsAllowUseMyGeopositionSetting, Converter={StaticResource SettingsConverter}, Mode=TwoWay, Source={StaticResource AppSettings}}"
                    CallUserHelpPage="ToggleSwitchWithHelp_OnCallUserHelpPage"/>

public SettingsPage()
    {
        InitializeComponent();

        ToggleSwitchWithHelp.CallUserHelpPage += ToggleSwitchWithHelp_OnCallUserHelpPage;
    }