Save() Load()

<Window x:Class="Chart.MainWindow"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
xmlns:local="clr-namespace:Chart"
xmlns:charting="http://schemas.stocksharp.com/xaml"
mc:Ignorable="d"
Title="MainWindow" Height="450" Width="800">
<Grid>
<charting:ChartPanel Name="ChartPanel"/>
</Grid>
</Window>

public partial class MainWindow : Window
{
private SettingsStorage SettingsStorage { get; set; }
public MainWindow()
{
InitializeComponent();
if (File.Exists("Setting.xml"))
{
//Загружаем настройки
SettingsStorage = new XmlSerializer<SettingsStorage>().Deserialize("Setting.xml");
ChartPanel.Load(SettingsStorage);
return;
}
SettingsStorage = new SettingsStorage();

//Создаем область и элемент
var area = new ChartArea();
area.Elements.Add(new ChartCandleElement());
ChartPanel.Areas.Add(area);
}

protected override void OnClosing(CancelEventArgs e)
{
//Сохраняем настройки и закрываем приложение
ChartPanel.Save(SettingsStorage);
new XmlSerializer<SettingsStorage>().Serialize(SettingsStorage, "Setting.xml");
base.OnClosing(e);
}
}

var area = new ChartArea();
area.Elements.Add(new ChartCandleElement());
ChartPanel.Areas.Add(area);