Updated the trackball sample

Synchronize_Trackball/.vs/Synchronize_Trackball/v17/DocumentLayout.json

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+{
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+    },
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+      "RelativeMoniker": "D:0:0:{2AE8056D-FC80-4398-A603-35E59086C4CA}|Synchronize_Trackball.csproj|solutionrelative:mainwindow.xaml.cs||{A6C744A8-0E4A-4FC6-886A-064283054674}"
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+            {
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+              "Title": "MainWindow.xaml.cs",
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+              "RelativeDocumentMoniker": "MainWindow.xaml.cs",
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+            {
+              "$type": "Document",
+              "DocumentIndex": 0,
+              "Title": "MainWindow.xaml",
+              "DocumentMoniker": "D:\\WPF Samples\\Synchronize_Trackball\\MainWindow.xaml",
+              "RelativeDocumentMoniker": "MainWindow.xaml",
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+      ]
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+  ]
+}

Synchronize_Trackball/App.xaml

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+<Application x:Class="Synchronize_Trackball.App"
+             xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
+             xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
+             xmlns:local="clr-namespace:Synchronize_Trackball"
+             StartupUri="MainWindow.xaml">
+    <Application.Resources>
+
+    </Application.Resources>
+</Application>

Synchronize_Trackball/App.xaml.cs

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+using System.Configuration;
+using System.Data;
+using System.Windows;
+
+namespace Synchronize_Trackball
+{
+    /// <summary>
+    /// Interaction logic for App.xaml
+    /// </summary>
+    public partial class App : Application
+    {
+    }
+
+}

Synchronize_Trackball/AssemblyInfo.cs

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+using System.Windows;
+
+[assembly: ThemeInfo(
+    ResourceDictionaryLocation.None,            //where theme specific resource dictionaries are located
+                                                //(used if a resource is not found in the page,
+                                                // or application resource dictionaries)
+    ResourceDictionaryLocation.SourceAssembly   //where the generic resource dictionary is located
+                                                //(used if a resource is not found in the page,
+                                                // app, or any theme specific resource dictionaries)
+)]

Synchronize_Trackball/MainWindow.xaml

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+<Window x:Class="Synchronize_Trackball.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:chart="clr-namespace:Syncfusion.UI.Xaml.Charts;assembly=Syncfusion.SfChart.WPF"
+        xmlns:local="clr-namespace:Synchronize_Trackball"
+        mc:Ignorable="d"
+        Title="MainWindow" Height="450" Width="800">
+    <Grid>
+        <Grid.DataContext>
+            <local:DataGenerator/>
+        </Grid.DataContext>
+
+        <Grid.RowDefinitions>
+            <RowDefinition />
+            <RowDefinition />
+        </Grid.RowDefinitions>
+
+        <chart:SfChart x:Name="chart1" MouseMove="SfChart_MouseMove1" Header="FirstChart" Margin="5">
+
+            <chart:SfChart.Behaviors>
+                <local:CustomTrackBallBehavior x:Name="behavior1"/>
+            </chart:SfChart.Behaviors>
+
+            <chart:SfChart.PrimaryAxis>
+                <chart:DateTimeAxis ShowTrackBallInfo="True" x:Name="axis" LabelFormat="MM/dd/yy"  />
+            </chart:SfChart.PrimaryAxis>
+
+            <chart:SfChart.SecondaryAxis>
+                <chart:NumericalAxis ShowTrackBallInfo="True" x:Name="secAxis"/>
+            </chart:SfChart.SecondaryAxis>
+
+            <chart:FastLineSeries x:Name="series1" XBindingPath="Date" YBindingPath="Value"
+                           ItemsSource="{Binding DataCollection1}"/>
+
+        </chart:SfChart>
+
+        <chart:SfChart x:Name="chart2" MouseMove="SfChart_MouseMove2" Grid.Row="1" Grid.Column="0" Header="Second Chart" Margin="5">
+
+            <chart:SfChart.Behaviors>
+                <local:CustomTrackBallBehavior  x:Name="behavior2"/>
+            </chart:SfChart.Behaviors>
+
+            <chart:SfChart.PrimaryAxis>
+                <chart:DateTimeAxis ShowTrackBallInfo="True" LabelFormat="MM/dd/yy"/>
+            </chart:SfChart.PrimaryAxis>
+
+            <chart:SfChart.SecondaryAxis>
+                <chart:NumericalAxis ShowTrackBallInfo="True" />
+            </chart:SfChart.SecondaryAxis>
+
+            <chart:FastLineSeries x:Name="series3" XBindingPath="Date" YBindingPath="Value" 
+                           ItemsSource="{Binding DataCollection2}"/>
+        </chart:SfChart>
+    </Grid>
+</Window>

Synchronize_Trackball/MainWindow.xaml.cs

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+using System.Collections.ObjectModel;
+using Syncfusion.UI.Xaml.Charts;
+using System.Text;
+using System.Windows;
+using System.Windows.Controls;
+using System.Windows.Data;
+using System.Windows.Documents;
+using System.Windows.Input;
+using System.Windows.Media;
+using System.Windows.Media.Imaging;
+using System.Windows.Navigation;
+using System.Windows.Shapes;
+
+namespace Synchronize_Trackball
+{
+    /// <summary>
+    /// Interaction logic for MainWindow.xaml
+    /// </summary>
+    public partial class MainWindow : Window
+    {
+        public Point MousePoint
+        {
+            get;
+            set;
+        }
+
+        public MainWindow()
+        {
+            InitializeComponent();
+        }
+
+        private void SfChart_MouseMove1(object sender, MouseEventArgs e)
+        {
+            // Taking the first chart position as reference to get the mouse point.
+            MousePoint = Mouse.GetPosition(behavior1.AdorningCanvas);
+            var chart1 = (sender as SfChart);
+
+            if (chart1.SeriesClipRect.Contains(MousePoint))
+            {
+                // Generalizing position with respect to axis width.
+                MousePoint = new Point(
+                MousePoint.X - chart1.SeriesClipRect.Left,
+                MousePoint.Y - chart1.SeriesClipRect.Top);
+
+                behavior1.ActivateTrackball(MousePoint);
+                behavior2.ActivateTrackball(MousePoint);
+            }
+            else
+            {
+                behavior1.DeactivateTrackball();
+                behavior2.DeactivateTrackball();
+            }
+        }
+
+        private void SfChart_MouseMove2(object sender, MouseEventArgs e)
+        {
+            // Taking the second chart position as reference to get the mouse point.
+            MousePoint = Mouse.GetPosition(behavior2.AdorningCanvas);
+            var chart2 = (sender as SfChart);
+
+            if (chart2.SeriesClipRect.Contains(MousePoint))
+            {
+                // Generalizing position with respect to axis width.
+                MousePoint = new Point(
+                MousePoint.X - chart2.SeriesClipRect.Left,
+                MousePoint.Y - chart2.SeriesClipRect.Top);
+
+                behavior1.ActivateTrackball(MousePoint);
+                behavior2.ActivateTrackball(MousePoint);
+            }
+            else
+            {
+                behavior1.DeactivateTrackball();
+                behavior2.DeactivateTrackball();
+            }
+        }
+    }
+
+
+    public class CustomTrackBallBehavior : ChartTrackBallBehavior
+    {
+        public void ActivateTrackball(Point mousePoint)
+        {
+            IsActivated = true;
+            OnPointerPositionChanged(mousePoint);
+        }
+
+        public void DeactivateTrackball()
+        {
+            IsActivated = false;
+        }
+
+        // This method is overriden to improve perfomance by preventing the mouse position calculation which we have done already.
+        protected override void OnMouseMove(MouseEventArgs e)
+        {
+        }
+    }
+
+    public class Data
+    {
+        public Data(DateTime date, double value)
+        {
+            Date = date;
+            Value = value;
+        }
+
+        public DateTime Date
+        {
+            get;
+            set;
+        }
+
+        public double Value
+        {
+            get;
+            set;
+        }
+    }
+
+    public class DataGenerator
+    {
+        public int DataCount = 100;
+        private Random randomNumber;
+        public ObservableCollection<Data> DataCollection1 { get; set; }
+        public ObservableCollection<Data> DataCollection2 { get; set; }
+
+        public DataGenerator()
+        {
+            randomNumber = new Random();
+            DataCollection1 = GenerateData();
+            DataCollection2 = GenerateData();
+        }
+
+        public ObservableCollection<Data> GenerateData()
+        {
+            ObservableCollection<Data> datas = new ObservableCollection<Data>();
+            DateTime date = new DateTime(2020, 1, 1);
+            double value = 100;
+
+            for (int i = 0; i < this.DataCount; i++)
+            {
+                datas.Add(new Data(date, Math.Round(value, 2)));
+                date = date.Add(TimeSpan.FromDays(1));
+
+                if (randomNumber.NextDouble() > .5)
+                {
+                    value += randomNumber.NextDouble();
+                }
+                else
+                {
+                    value -= randomNumber.NextDouble();
+                }
+            }
+
+            return datas;
+        }
+    }
+}

Synchronize_Trackball/Synchronize_Trackball.csproj

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+<Project Sdk="Microsoft.NET.Sdk">
+
+  <PropertyGroup>
+    <OutputType>WinExe</OutputType>
+    <TargetFramework>net8.0-windows</TargetFramework>
+    <Nullable>enable</Nullable>
+    <ImplicitUsings>enable</ImplicitUsings>
+    <UseWPF>true</UseWPF>
+  </PropertyGroup>
+
+  <ItemGroup>
+    <PackageReference Include="Syncfusion.SfChart.WPF" Version="*" />
+  </ItemGroup>
+
+</Project>

Synchronize_Trackball/Synchronize_Trackball.csproj.user

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+<?xml version="1.0" encoding="utf-8"?>
+<Project ToolsVersion="Current" xmlns="http://schemas.microsoft.com/developer/msbuild/2003">
+  <PropertyGroup />
+  <ItemGroup>
+    <ApplicationDefinition Update="App.xaml">
+      <SubType>Designer</SubType>
+    </ApplicationDefinition>
+  </ItemGroup>
+  <ItemGroup>
+    <Page Update="MainWindow.xaml">
+      <SubType>Designer</SubType>
+    </Page>
+  </ItemGroup>
+</Project>

Synchronize_Trackball/Synchronize_Trackball.sln

@@ -0,0 +1,22 @@
+
+Microsoft Visual Studio Solution File, Format Version 12.00
+# Visual Studio Version 17
+VisualStudioVersion = 17.12.35506.116 d17.12
+MinimumVisualStudioVersion = 10.0.40219.1
+Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "Synchronize_Trackball", "Synchronize_Trackball.csproj", "{2AE8056D-FC80-4398-A603-35E59086C4CA}"
+EndProject
+Global
+	GlobalSection(SolutionConfigurationPlatforms) = preSolution
+		Debug|Any CPU = Debug|Any CPU
+		Release|Any CPU = Release|Any CPU
+	EndGlobalSection
+	GlobalSection(ProjectConfigurationPlatforms) = postSolution
+		{2AE8056D-FC80-4398-A603-35E59086C4CA}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
+		{2AE8056D-FC80-4398-A603-35E59086C4CA}.Debug|Any CPU.Build.0 = Debug|Any CPU
+		{2AE8056D-FC80-4398-A603-35E59086C4CA}.Release|Any CPU.ActiveCfg = Release|Any CPU
+		{2AE8056D-FC80-4398-A603-35E59086C4CA}.Release|Any CPU.Build.0 = Release|Any CPU
+	EndGlobalSection
+	GlobalSection(SolutionProperties) = preSolution
+		HideSolutionNode = FALSE
+	EndGlobalSection
+EndGlobal