public class CustomDrawCrosshairEventArgs :
    EventArgs

Public Class CustomDrawCrosshairEventArgs
    Inherits EventArgs

using System;
using System.Drawing;
using System.Windows.Forms;
using DevExpress.Drawing;
using DevExpress.XtraCharts;

namespace CustomDrawCrosshairCursor {
    public partial class Form1 : Form {
        public Form1() {
            InitializeComponent();
        }
        private void OnCheckEditCheckedChanged(object sender, EventArgs e) {
            if (checkEdit1.Checked)
                chartControl1.CustomDrawCrosshair += OnChartControlCustomDrawCrosshair;
            else 
                chartControl1.CustomDrawCrosshair -= OnChartControlCustomDrawCrosshair;               
        }

        private void OnChartControlCustomDrawCrosshair(object sender, CustomDrawCrosshairEventArgs e) {
            // Specify the crosshair argument line color, dash style and thickness.
            e.CrosshairLineElement.Color = Color.Green;
            e.CrosshairLineElement.LineStyle.DashStyle = DashStyle.DashDot;
            e.CrosshairLineElement.LineStyle.Thickness = 3;

            // Specify the back color for the crosshair argument axis label. 
            foreach (CrosshairAxisLabelElement axisLabelElement in e.CrosshairAxisLabelElements)
                axisLabelElement.BackColor = Color.Blue;

            foreach (CrosshairElementGroup group in e.CrosshairElementGroups) {
                CrosshairGroupHeaderElement groupHeaderElement = group.HeaderElement;

                // Specify the text, text color and font for the crosshair group header element. 
                groupHeaderElement.Text = "Custom draw";
                groupHeaderElement.TextColor = Color.Green;
                groupHeaderElement.DXFont = new DXFont("SegoeUI", 12, DXFontStyle.Bold);

                // Obtain the first series.
                CrosshairElement element = group.CrosshairElements[0];

                // Specify the color, dash style and thickness for the crosshair value lines. 
                element.LineElement.Color = Color.DarkViolet;
                element.LineElement.LineStyle.DashStyle = DashStyle.Dash;
                element.LineElement.LineStyle.Thickness = 2;

                // Specify the text color and back color for the crosshair value labels.
                element.AxisLabelElement.TextColor = Color.Red;
                element.AxisLabelElement.BackColor = Color.Yellow;

                // Format the text shown for the series in the crosshair cursor label. Specify the text color and marker size. 
                element.LabelElement.TextColor = Color.Red;
                element.LabelElement.MarkerSize = new Size(15, 15);
                element.LabelElement.Text = string.Format("{0}: A={1}; V={2}", element.Series.Name, element.SeriesPoint.Argument, element.SeriesPoint.Values[0]);
            }
        }
    }
}

Imports System
Imports System.Drawing
Imports System.Windows.Forms
Imports DevExpress.Drawing
Imports DevExpress.XtraCharts

Namespace CustomDrawCrosshairCursor

    Public Partial Class Form1
        Inherits Form

        Public Sub New()
            InitializeComponent()
        End Sub

        Private Sub OnCheckEditCheckedChanged(ByVal sender As Object, ByVal e As EventArgs)
            If checkEdit1.Checked Then
                AddHandler chartControl1.CustomDrawCrosshair, AddressOf OnChartControlCustomDrawCrosshair
            Else
                RemoveHandler chartControl1.CustomDrawCrosshair, AddressOf OnChartControlCustomDrawCrosshair
            End If
        End Sub

        Private Sub OnChartControlCustomDrawCrosshair(ByVal sender As Object, ByVal e As CustomDrawCrosshairEventArgs)
            ' Specify the crosshair argument line color, dash style and thickness.
            e.CrosshairLineElement.Color = Color.Green
            e.CrosshairLineElement.LineStyle.DashStyle = DashStyle.DashDot
            e.CrosshairLineElement.LineStyle.Thickness = 3
            ' Specify the back color for the crosshair argument axis label. 
            For Each axisLabelElement As CrosshairAxisLabelElement In e.CrosshairAxisLabelElements
                axisLabelElement.BackColor = Color.Blue
            Next

            For Each group As CrosshairElementGroup In e.CrosshairElementGroups
                Dim groupHeaderElement As CrosshairGroupHeaderElement = group.HeaderElement
                ' Specify the text, text color and font for the crosshair group header element. 
                groupHeaderElement.Text = "Custom draw"
                groupHeaderElement.TextColor = Color.Green
                groupHeaderElement.DXFont = New DXFont("SegoeUI", 12, DXFontStyle.Bold)
                ' Obtain the first series.
                Dim element As CrosshairElement = group.CrosshairElements(0)
                ' Specify the color, dash style and thickness for the crosshair value lines. 
                element.LineElement.Color = Color.DarkViolet
                element.LineElement.LineStyle.DashStyle = DashStyle.Dash
                element.LineElement.LineStyle.Thickness = 2
                ' Specify the text color and back color for the crosshair value labels.
                element.AxisLabelElement.TextColor = Color.Red
                element.AxisLabelElement.BackColor = Color.Yellow
                ' Format the text shown for the series in the crosshair cursor label. Specify the text color and marker size. 
                element.LabelElement.TextColor = Color.Red
                element.LabelElement.MarkerSize = New Size(15, 15)
                element.LabelElement.Text = String.Format("{0}: A={1}; V={2}", element.Series.Name, element.SeriesPoint.Argument, element.SeriesPoint.Values(0))
            Next
        End Sub
    End Class
End Namespace

using CustomDrawCrosshairSample.Model;
using DevExpress.Drawing;
using DevExpress.XtraCharts;
using System;
using System.Collections.Generic;
using System.Drawing;
using System.IO;
using System.Linq;

namespace CustomDrawCrosshairSample {
    public partial class Form1 : DevExpress.XtraEditors.XtraForm {
        Dictionary<string, DXImage> photoCache = new Dictionary<string, DXImage>();
        Dictionary<string, DXBitmap> bitmapCache = new Dictionary<string, DXBitmap>();
        #region #Constants
        const int borderSize = 2;
        const int scaledPhotoWidth = 32;
        const int scaledPhotoHeight = 34;
        // Width and height of scaled photo with border.
        const int totalWidth = 36;
        const int totalHeight = 38;

        // Rects required to create a custom legend series marker.
        static readonly Rectangle photoRect = new Rectangle(
                borderSize, borderSize,
                scaledPhotoWidth, scaledPhotoHeight);
        static readonly Rectangle totalRect = new Rectangle(
                0, 0,
                totalWidth, totalHeight);
        #endregion

        public Form1() {
            InitializeComponent();
        }

        private void Form1_Load(object sender, EventArgs e) {
            using (var context = new NwindDbContext()) {
                InitPhotoCache(context.Employees);
                chart.DataSource = context.Orders.ToList();
            }

            chart.SeriesDataMember = "Employee.FullName";
            chart.SeriesTemplate.ArgumentDataMember = "OrderDate";
            chart.SeriesTemplate.ValueDataMembers.AddRange("Freight");

            XYDiagram diagram = chart.Diagram as XYDiagram;
            if (diagram != null) {
                diagram.AxisX.DateTimeScaleOptions.AggregateFunction = AggregateFunction.Sum;
                diagram.AxisX.DateTimeScaleOptions.MeasureUnit = DateTimeMeasureUnit.Year;
            }

            chart.CustomDrawCrosshair += OnCustomDrawCrosshair;
        }

        void InitPhotoCache(IEnumerable<Employee> employees) {
            photoCache.Clear();
            foreach (var employee in employees) {
                using (MemoryStream stream = new MemoryStream(employee.Photo)) {
                    if (!photoCache.ContainsKey(employee.FullName))
                        photoCache.Add(employee.FullName, DXImage.FromStream(stream));
                }
            }
        }

        #region #CustomDrawCrosshairHandler
        private void OnCustomDrawCrosshair(object sender, CustomDrawCrosshairEventArgs e) {
            foreach (CrosshairElementGroup group in e.CrosshairElementGroups) {
                if (group.CrosshairElements[0] != null)
                    group.HeaderElement.Text = String.Format("Sales in {0:yyyy}", group.CrosshairElements[0].SeriesPoint.DateTimeArgument);
                foreach (CrosshairElement element in group.CrosshairElements) {
                    DXBitmap image;
                    if (!bitmapCache.TryGetValue(element.Series.Name, out image)) {
                        image = new DXBitmap(totalWidth, totalHeight);
                        using (DXGraphics graphics = DXGraphics.FromImage(image)) {
                            using (DXSolidBrush brush = new DXSolidBrush(element.LabelElement.MarkerColor)) {
                                graphics.FillRectangle(brush, totalRect);
                            }
                            DXImage photo;
                            if (photoCache.TryGetValue(element.Series.Name, out photo))
                                graphics.DrawImage(photo, photoRect);
                        }
                        bitmapCache.Add(element.Series.Name, image);
                    }
                    element.LabelElement.DXMarkerImage = image;
                    element.LabelElement.MarkerSize = new Size(totalWidth, totalHeight);
                }
            }
        }
        #endregion 
    }
}

Imports CustomDrawCrosshairSample.Model
Imports DevExpress.Drawing
Imports DevExpress.XtraCharts
Imports System
Imports System.Collections.Generic
Imports System.Drawing
Imports System.IO
Imports System.Linq

Namespace CustomDrawCrosshairSample

    Public Partial Class Form1
        Inherits DevExpress.XtraEditors.XtraForm

        Private photoCache As Dictionary(Of String, DXImage) = New Dictionary(Of String, DXImage)()

        Private bitmapCache As Dictionary(Of String, DXBitmap) = New Dictionary(Of String, DXBitmap)()

#Region "#Constants"
        Const borderSize As Integer = 2

        Const scaledPhotoWidth As Integer = 32

        Const scaledPhotoHeight As Integer = 34

        ' Width and height of scaled photo with border.
        Const totalWidth As Integer = 36

        Const totalHeight As Integer = 38

        ' Rects required to create a custom legend series marker.
        Private Shared ReadOnly photoRect As Rectangle = New Rectangle(borderSize, borderSize, scaledPhotoWidth, scaledPhotoHeight)

        Private Shared ReadOnly totalRect As Rectangle = New Rectangle(0, 0, totalWidth, totalHeight)

#End Region
        Public Sub New()
            InitializeComponent()
        End Sub

        Private Sub Form1_Load(ByVal sender As Object, ByVal e As EventArgs)
            Using context = New NwindDbContext()
                InitPhotoCache(context.Employees)
                chart.DataSource = context.Orders.ToList()
            End Using

            chart.SeriesDataMember = "Employee.FullName"
            chart.SeriesTemplate.ArgumentDataMember = "OrderDate"
            chart.SeriesTemplate.ValueDataMembers.AddRange("Freight")
            Dim diagram As XYDiagram = TryCast(chart.Diagram, XYDiagram)
            If diagram IsNot Nothing Then
                diagram.AxisX.DateTimeScaleOptions.AggregateFunction = AggregateFunction.Sum
                diagram.AxisX.DateTimeScaleOptions.MeasureUnit = DateTimeMeasureUnit.Year
            End If

            AddHandler chart.CustomDrawCrosshair, AddressOf OnCustomDrawCrosshair
        End Sub

        Private Sub InitPhotoCache(ByVal employees As IEnumerable(Of Employee))
            photoCache.Clear()
            For Each employee In employees
                Using stream As MemoryStream = New MemoryStream(employee.Photo)
                    If Not photoCache.ContainsKey(employee.FullName) Then photoCache.Add(employee.FullName, DXImage.FromStream(stream))
                End Using
            Next
        End Sub

#Region "#CustomDrawCrosshairHandler"
        Private Sub OnCustomDrawCrosshair(ByVal sender As Object, ByVal e As CustomDrawCrosshairEventArgs)
            For Each group As CrosshairElementGroup In e.CrosshairElementGroups
                If group.CrosshairElements(0) IsNot Nothing Then group.HeaderElement.Text = String.Format("Sales in {0:yyyy}", group.CrosshairElements(0).SeriesPoint.DateTimeArgument)
                For Each element As CrosshairElement In group.CrosshairElements
                    Dim image As DXBitmap
                    If Not bitmapCache.TryGetValue(element.Series.Name, image) Then
                        image = New DXBitmap(totalWidth, totalHeight)
                        Using graphics As DXGraphics = DXGraphics.FromImage(image)
                            Using brush As DXSolidBrush = New DXSolidBrush(element.LabelElement.MarkerColor)
                                graphics.FillRectangle(brush, totalRect)
                            End Using

                            Dim photo As DXImage
                            If photoCache.TryGetValue(element.Series.Name, photo) Then graphics.DrawImage(photo, photoRect)
                        End Using

                        bitmapCache.Add(element.Series.Name, image)
                    End If

                    element.LabelElement.DXMarkerImage = image
                    element.LabelElement.MarkerSize = New Size(totalWidth, totalHeight)
                Next
            Next
        End Sub
#End Region
    End Class
End Namespace